Centered element with an `aspect-ratio` take up the maximum available space

Centered element with an `aspect-ratio` take up the maximum available space - css

I'm trying to make a centered element with an aspect-ratio take up the most available space, can be either vertical or horizontal.
To do this I simply created an outer element with display: grid; place-content: center;, and an inner element with aspect-ratio.
By adding height: 100%; width: 100%; to the inner element I get it to fill the available space on Chrome and Firefox, but this doesn't work in Safari.
Any ideas why this happens?
.outer {
display: grid;
place-content: center;
margin: 3px;
background: green;
}
.horizontal {
width: 100px;
height: 50px;
}
.vertical {
width: 100px;
height: 100px;
}
.inner {
aspect-ratio: 16 / 9;
height: 100%;
width: 100%;
background-color: red;
font-size: 10px;
}
<div class="outer horizontal">
<div class="inner">Horizontal</div>
</div>
<div class="outer vertical">
<div class="inner">Vertical</div>
</div>
Chrome and Firefox
Safari

Related

to position center in a view / position:absolute &? [duplicate]

I am trying to center my tabs content vertically, but when I add the CSS style display:inline-flex, the horizontal text-align disappears.
How can I make both text alignments x and y for each of my tabs?
* { box-sizing: border-box; }
#leftFrame {
background-color: green;
position: absolute;
left: 0;
right: 60%;
top: 0;
bottom: 0;
}
#leftFrame #tabs {
background-color: red;
position: absolute;
top: 0;
left: 0;
right: 0;
height: 25%;
}
#leftFrame #tabs div {
border: 2px solid black;
position: static;
float: left;
width: 50%;
height: 100%;
text-align: center;
display: inline-flex;
align-items: center;
}
<div id=leftFrame>
<div id=tabs>
<div>first</div>
<div>second</div>
</div>
</div>

Approach 1 - transform translateX/translateY:
Example Here / Full Screen Example
In supported browsers (most of them), you can use top: 50%/left: 50% in combination with translateX(-50%) translateY(-50%) to dynamically vertically/horizontally center the element.
.container {
position: absolute;
top: 50%;
left: 50%;
-moz-transform: translateX(-50%) translateY(-50%);
-webkit-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
}
<div class="container">
<span>I'm vertically/horizontally centered!</span>
</div>
Approach 2 - Flexbox method:
Example Here / Full Screen Example
In supported browsers, set the display of the targeted element to flex and use align-items: center for vertical centering and justify-content: center for horizontal centering. Just don't forget to add vendor prefixes for additional browser support (see example). Remember the parent container will also need height (in this case, 100%).
html, body, .container {
height: 100%;
}
.container {
display: -webkit-flexbox;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
-webkit-flex-align: center;
-ms-flex-align: center;
-webkit-align-items: center;
align-items: center;
justify-content: center;
}
<div class="container">
<span>I'm vertically/horizontally centered!</span>
</div>
Approach 3 - table-cell/vertical-align: middle:
Example Here / Full Screen Example
In some cases, you will need to ensure that the html/body element's height is set to 100%.
For vertical alignment, set the parent element's width/height to 100% and add display: table. Then for the child element, change the display to table-cell and add vertical-align: middle.
For horizontal centering, you could either add text-align: center to center the text and any other inline children elements. Alternatively, you could use margin: 0 auto, assuming the element is block level.
html, body {
height: 100%;
}
.parent {
width: 100%;
height: 100%;
display: table;
text-align: center;
}
.parent > .child {
display: table-cell;
vertical-align: middle;
}
<section class="parent">
<div class="child">I'm vertically/horizontally centered!</div>
</section>
Approach 4 - Absolutely positioned 50% from the top with displacement:
Example Here / Full Screen Example
This approach assumes that the text has a known height - in this instance, 18px. Just absolutely position the element 50% from the top, relative to the parent element. Use a negative margin-top value that is half of the element's known height, in this case - -9px.
html, body, .container {
height: 100%;
}
.container {
position: relative;
text-align: center;
}
.container > p {
position: absolute;
top: 50%;
left: 0;
right: 0;
margin-top: -9px;
}
<div class="container">
<p>I'm vertically/horizontally centered!</p>
</div>
Approach 5 - The line-height method (Least flexible - not suggested):
Example Here
In some cases, the parent element will have a fixed height. For vertical centering, all you have to do is set a line-height value on the child element equal to the fixed height of the parent element.
Though this solution will work in some cases, it's worth noting that it won't work when there are multiple lines of text - like this.
.parent {
height: 200px;
width: 400px;
background: lightgray;
text-align: center;
}
.parent > .child {
line-height: 200px;
}
<div class="parent">
<span class="child">I'm vertically/horizontally centered!</span>
</div>

If CSS3 is an option (or you have a fallback) you can use transform:
.center {
right: 50%;
bottom: 50%;
transform: translate(50%,50%);
position: absolute;
}
Unlike the first approach above, you don't want to use left:50% with the negative translation because there's an overflow bug in IE9+. Utilize a positive right value and you won't see horizontal scrollbars.

Here is how to use two simple flexbox properties to center n divs on the two axes:
Set the height of your container: Here the body is set to be at least 100 viewport height.
align-items: center; will center the blocks vertically if flex direction is row else horizontally if flex direction is column
justify-content: space-around; will distribute the free space vertically if flex direction is row else horizontally if flex direction is column around the div elements
body {
min-height: 100vh;
display: flex;
align-items: center;
justify-content: space-around;
}
<div>foo</div>
<div>bar</div>

The best way to center a box both vertically and horizontally, is to use two containers :
The outher container :
should have display: table;
The inner container :
should have display: table-cell;
should have vertical-align: middle;
should have text-align: center;
The content box :
should have display: inline-block;
should adjust the horizontal text-alignment, unless you want text to be centered
Demo :
body {
margin : 0;
}
.outer-container {
display: table;
width: 80%;
height: 120px;
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding : 20px;
border : 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Center this!
</div>
</div>
</div>
See also this Fiddle!
Centering in the middle of the page:
To center your content in the middle of your page, add the following to your outer container :
position : absolute;
width: 100%;
height: 100%;
Here's a demo for that :
body {
margin : 0;
}
.outer-container {
position : absolute;
display: table;
width: 100%;
height: 100%;
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding : 20px;
border : 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Center this!
</div>
</div>
</div>
See also this Fiddle!

CSS Grid: place-items
Finally, we have place-items: center for CSS Grid to make it easier.
HTML
<div class="parent">
<div class="to-center"></div>
</div>
CSS
.parent {
display: grid;
place-items: center;
}
Output:
html,
body {
height: 100%;
}
.container {
display: grid;
place-items: center;
height: 100%;
}
.center {
background: #5F85DB;
color: #fff;
font-weight: bold;
font-family: Tahoma;
padding: 10px;
}
<div class="container">
<div class="center" contenteditable>I am always super centered within my parent</div>
</div>

Run this code snippet and see a vertically and horizontally aligned div.
html,
body,
.container {
height: 100%;
width: 100%;
}
.container {
display: flex;
align-items: center;
justify-content: center;
}
.mydiv {
width: 80px;
}
<div class="container">
<div class="mydiv">h & v aligned</div>
</div>

.align {
display: flex;
width: 400px;
height: 400px;
border: solid 1px black;
align-items: center;
justify-content: space-around;
}
.align div:first-child {
width: 20px;
height: 20px;
background-color: red;
position: absolute;
}
.align div {
width: 20px;
height: 20px;
background-color: blue;
}
<div class='align'>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
First child will be aligned vertically and horizontally at center

Source Link
Method 1) Display type flex
.child-element{
display: flex;
justify-content: center;
align-items: center;
}
Method 2) 2D Transform
.child-element {
top: 50%;
left: 50%;
transform: translate(-50% , -50%);
position: absolute;
}
See other methods here

to center the Div in a page check the fiddle link
#vh {
border-radius: 15px;
box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
padding: 25px;
width: 200px;
height: 200px;
background: white;
text-align: center;
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
<div id="vh">Div to be aligned vertically</div>
Update
Another option is to use flex box check the fiddle link
.vh {
background-color: #ddd;
height: 200px;
align-items: center;
display: flex;
}
.vh > div {
width: 100%;
text-align: center;
vertical-align: middle;
}
<div class="vh">
<div>Div to be aligned vertically</div>
</div>

Below is the Flex-box approach to get desired result
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Flex-box approach</title>
<style>
.tabs{
display: -webkit-flex;
display: flex;
width: 500px;
height: 250px;
background-color: grey;
margin: 0 auto;
}
.f{
width: 200px;
height: 200px;
margin: 20px;
background-color: yellow;
margin: 0 auto;
display: inline; /*for vertically aligning */
top: 9%; /*for vertically aligning */
position: relative; /*for vertically aligning */
}
</style>
</head>
<body>
<div class="tabs">
<div class="f">first</div>
<div class="f">second</div>
</div>
</body>
</html>

Another approach is to use table:
<div style="border:2px solid #8AC007; height:200px; width:200px;">
<table style="width:100%; height:100%">
<tr style="height:100%">
<td style="height:100%; text-align:center">hello, multiple lines here, this is super long, and that is awesome, dude</td>
</tr>
</table>
</div>

Grid css approach
#wrapper {
position: absolute;
top: 0;
bottom: 0;
right: 0;
left: 0;
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-template-rows: repeat(3, 1fr);
}
.main {
background-color: #444;
}
<div id="wrapper">
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box main"></div>
</div>

Need to follow following New and easy solution:
.centered-class {
align-items: center;
display: flex;
justify-content: center;
width: 100vw;
height: 100vh;
}
<div class="centered-class">
I'm in center vertically and horizontally.
</div>

The simplest and cleanest solution for me is using the CSS3 property "transform":
.container {
position: relative;
}
.container a {
position: absolute;
top: 50%;
transform: translate(0,-50%);
}
<div class="container">
Hello world!
</div>

In order to vertically and horizontally center an element we can also use below mentioned properties.
This CSS property aligns-items vertically and accepts the following values:
flex-start: Items align to the top of the container.
flex-end: Items align to the bottom of the container.
center: Items align at the vertical center of the container.
baseline: Items display at the baseline of the container.
stretch: Items are stretched to fit the container.
This CSS property justify-content , which aligns items horizontally and accepts the following values:
flex-start: Items align to the left side of the container.
flex-end: Items align to the right side of the container.
center: Items align at the center of the container.
space-between: Items display with equal spacing between them.
space-around: Items display with equal spacing around them.

Just make top,bottom, left and right to 0.
<html>
<head>
<style>
<div>
{
position: absolute;
margin: auto;
background-color: lightblue;
width: 100px;
height :100px;
padding: 25px;
top :0;
right :0;
bottom:0;
left:0;
}
</style>
</head>
<body>
<div> I am in the middle</div>
</body>
</html>

You can achieve this using CSS (your element display:inline-grid + grid-auto-flow: row; ) Grid and Flex Box ( parent element display:flex;),
See below snippet
#leftFrame {
display: flex;
height: 100vh;
width: 100%;
}
#tabs {
display: inline-grid;
grid-auto-flow: row;
grid-gap: 24px;
justify-items: center;
margin: auto;
}
html,body {
margin:0;
padding:0;
}
<div>
<div id=leftFrame>
<div id=tabs>
<div>first</div>
<div>second</div>
</div>
</div>
</div>

This should works
.center-div {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
text-align: center;
min-height: 100vh;
}
<div class="center-div">Center Div</div>

If you prefer it without flexbox, grid, table or vertical-align: middle;
You can do:
HTML
<div class="box">
<h2 class="box__label">square</h2>
</div>
CSS
.box {
box-sizing: border-box;
width: 100px;
height: 100px;
text-align: center;
border: 1px solid black;
}
.box__label {
box-sizing: border-box;
display: inline-block;
transform: translateY(50%);
text-align: center;
border: 1px solid black;
}

If it's only about text aligning it's simple. Just use this:
vertical-align: middle; /* vertical centering*/
text-align: center; /* horizontal centering*/
Parent styling is not needed.
In some cases when the parent has some style properties it may affect the child, where this will not work properly.

Approach 6
/*Change units to "%", "px" or whatever*/
#wrapper{
width: 50%;
height: 70vh;
background: rgba(0,0,0,.5);
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}
#left{
width: 50%;
height: 50vh;
position: absolute;
top: 0;
bottom: 0;
left: 0;
margin: auto;
background: red;
}
#right{
width: 50%;
height: 50vh;
position: absolute;
top: 0;
bottom: 0;
right: 0;
margin: auto;
background: green;
}
.txt{
text-align: center;
line-height: 50vh;
}
<div id="wrapper">
<div id="left" class="txt">Left</div>
<div id="right" class="txt">Right</div>
</div>
.container{
width: 50%; //Your container width here
height: 50%; //Your container height here
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}

The easiest way of centering a div both vertically and horizontally is as follows:
<div style="display: table; width: 200px; height: 200px; border: 1px solid black;">
<div style="display: table-cell; vertical-align: middle; text-align: center;">
Text Here
</div>
</div>
One More Example:
.parent {
display: table;
width: 100%;
height: 100%;
}
.child {
display: table-cell;
vertical-align: middle;
text-align: center;
}
<div class="parent">
<div class="child">
<h4><u>SERVICE IN BANGLADESH FLEET RESERVE <br> AND <br> RE-ENGAGEMENT ORDER FOR DEFENCE SERVICE</u></h4>
</div>
</div>

I see this the shortest and easiest way. However it depends on the element width and height. So feel free to adjust more the percentages on translate(50%, 50%);.
.divContainer {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
transform: translate(50%, 50%);
}
<div class="divContainer">I am centered</div>

The simplest flexbox approach:
The easiest way how to center a single element vertically and horizontally is to make it a flex item and set its margin to auto:
If you apply auto margins to a flex item, that item will automatically
extend its specified margin to occupy the extra space in the flex
container...
.flex-container {
height: 150px;
display: flex;
}
.flex-item {
margin: auto;
}
<div class="flex-container">
<div class="flex-item">
This should be centered!
</div>
</div>
This extension of margins in each direction will push the element exactly to the middle of its container.

In the case where I was trying to vertically align text content inside button::before and button::after, I was able to get it working using vertical-align: text-top.
button::after {
vertical-align: text-top;
}

I use this CSS code:
display: grid;
justify-content: center;
align-items: center;
The source is CSS-Tricks

This is a related problem that people might come to this page when searching: When I want to centre a div for a "waiting.." 100px square animated gif, I use:
.centreDiv {
position: absolute;
top: -moz-calc(50vh - 50px);
top: -webkit-calc(50vh - 50px);
top: calc(50vh - 50px);
left: -moz-calc(50vw - 50px);
left: -webkit-calc(50vw - 50px);
left: calc(50vw - 50px);
z-index: 1000; /* whatever is required */
}

Element Centering From The Left Instead Of Center [duplicate]

I am trying to center my tabs content vertically, but when I add the CSS style display:inline-flex, the horizontal text-align disappears.
How can I make both text alignments x and y for each of my tabs?
* { box-sizing: border-box; }
#leftFrame {
background-color: green;
position: absolute;
left: 0;
right: 60%;
top: 0;
bottom: 0;
}
#leftFrame #tabs {
background-color: red;
position: absolute;
top: 0;
left: 0;
right: 0;
height: 25%;
}
#leftFrame #tabs div {
border: 2px solid black;
position: static;
float: left;
width: 50%;
height: 100%;
text-align: center;
display: inline-flex;
align-items: center;
}
<div id=leftFrame>
<div id=tabs>
<div>first</div>
<div>second</div>
</div>
</div>

Approach 1 - transform translateX/translateY:
Example Here / Full Screen Example
In supported browsers (most of them), you can use top: 50%/left: 50% in combination with translateX(-50%) translateY(-50%) to dynamically vertically/horizontally center the element.
.container {
position: absolute;
top: 50%;
left: 50%;
-moz-transform: translateX(-50%) translateY(-50%);
-webkit-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
}
<div class="container">
<span>I'm vertically/horizontally centered!</span>
</div>
Approach 2 - Flexbox method:
Example Here / Full Screen Example
In supported browsers, set the display of the targeted element to flex and use align-items: center for vertical centering and justify-content: center for horizontal centering. Just don't forget to add vendor prefixes for additional browser support (see example). Remember the parent container will also need height (in this case, 100%).
html, body, .container {
height: 100%;
}
.container {
display: -webkit-flexbox;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
-webkit-flex-align: center;
-ms-flex-align: center;
-webkit-align-items: center;
align-items: center;
justify-content: center;
}
<div class="container">
<span>I'm vertically/horizontally centered!</span>
</div>
Approach 3 - table-cell/vertical-align: middle:
Example Here / Full Screen Example
In some cases, you will need to ensure that the html/body element's height is set to 100%.
For vertical alignment, set the parent element's width/height to 100% and add display: table. Then for the child element, change the display to table-cell and add vertical-align: middle.
For horizontal centering, you could either add text-align: center to center the text and any other inline children elements. Alternatively, you could use margin: 0 auto, assuming the element is block level.
html, body {
height: 100%;
}
.parent {
width: 100%;
height: 100%;
display: table;
text-align: center;
}
.parent > .child {
display: table-cell;
vertical-align: middle;
}
<section class="parent">
<div class="child">I'm vertically/horizontally centered!</div>
</section>
Approach 4 - Absolutely positioned 50% from the top with displacement:
Example Here / Full Screen Example
This approach assumes that the text has a known height - in this instance, 18px. Just absolutely position the element 50% from the top, relative to the parent element. Use a negative margin-top value that is half of the element's known height, in this case - -9px.
html, body, .container {
height: 100%;
}
.container {
position: relative;
text-align: center;
}
.container > p {
position: absolute;
top: 50%;
left: 0;
right: 0;
margin-top: -9px;
}
<div class="container">
<p>I'm vertically/horizontally centered!</p>
</div>
Approach 5 - The line-height method (Least flexible - not suggested):
Example Here
In some cases, the parent element will have a fixed height. For vertical centering, all you have to do is set a line-height value on the child element equal to the fixed height of the parent element.
Though this solution will work in some cases, it's worth noting that it won't work when there are multiple lines of text - like this.
.parent {
height: 200px;
width: 400px;
background: lightgray;
text-align: center;
}
.parent > .child {
line-height: 200px;
}
<div class="parent">
<span class="child">I'm vertically/horizontally centered!</span>
</div>

If CSS3 is an option (or you have a fallback) you can use transform:
.center {
right: 50%;
bottom: 50%;
transform: translate(50%,50%);
position: absolute;
}
Unlike the first approach above, you don't want to use left:50% with the negative translation because there's an overflow bug in IE9+. Utilize a positive right value and you won't see horizontal scrollbars.

Here is how to use two simple flexbox properties to center n divs on the two axes:
Set the height of your container: Here the body is set to be at least 100 viewport height.
align-items: center; will center the blocks vertically if flex direction is row else horizontally if flex direction is column
justify-content: space-around; will distribute the free space vertically if flex direction is row else horizontally if flex direction is column around the div elements
body {
min-height: 100vh;
display: flex;
align-items: center;
justify-content: space-around;
}
<div>foo</div>
<div>bar</div>

The best way to center a box both vertically and horizontally, is to use two containers :
The outher container :
should have display: table;
The inner container :
should have display: table-cell;
should have vertical-align: middle;
should have text-align: center;
The content box :
should have display: inline-block;
should adjust the horizontal text-alignment, unless you want text to be centered
Demo :
body {
margin : 0;
}
.outer-container {
display: table;
width: 80%;
height: 120px;
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding : 20px;
border : 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Center this!
</div>
</div>
</div>
See also this Fiddle!
Centering in the middle of the page:
To center your content in the middle of your page, add the following to your outer container :
position : absolute;
width: 100%;
height: 100%;
Here's a demo for that :
body {
margin : 0;
}
.outer-container {
position : absolute;
display: table;
width: 100%;
height: 100%;
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding : 20px;
border : 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Center this!
</div>
</div>
</div>
See also this Fiddle!

CSS Grid: place-items
Finally, we have place-items: center for CSS Grid to make it easier.
HTML
<div class="parent">
<div class="to-center"></div>
</div>
CSS
.parent {
display: grid;
place-items: center;
}
Output:
html,
body {
height: 100%;
}
.container {
display: grid;
place-items: center;
height: 100%;
}
.center {
background: #5F85DB;
color: #fff;
font-weight: bold;
font-family: Tahoma;
padding: 10px;
}
<div class="container">
<div class="center" contenteditable>I am always super centered within my parent</div>
</div>

Run this code snippet and see a vertically and horizontally aligned div.
html,
body,
.container {
height: 100%;
width: 100%;
}
.container {
display: flex;
align-items: center;
justify-content: center;
}
.mydiv {
width: 80px;
}
<div class="container">
<div class="mydiv">h & v aligned</div>
</div>

.align {
display: flex;
width: 400px;
height: 400px;
border: solid 1px black;
align-items: center;
justify-content: space-around;
}
.align div:first-child {
width: 20px;
height: 20px;
background-color: red;
position: absolute;
}
.align div {
width: 20px;
height: 20px;
background-color: blue;
}
<div class='align'>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
First child will be aligned vertically and horizontally at center

Source Link
Method 1) Display type flex
.child-element{
display: flex;
justify-content: center;
align-items: center;
}
Method 2) 2D Transform
.child-element {
top: 50%;
left: 50%;
transform: translate(-50% , -50%);
position: absolute;
}
See other methods here

to center the Div in a page check the fiddle link
#vh {
border-radius: 15px;
box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
padding: 25px;
width: 200px;
height: 200px;
background: white;
text-align: center;
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
<div id="vh">Div to be aligned vertically</div>
Update
Another option is to use flex box check the fiddle link
.vh {
background-color: #ddd;
height: 200px;
align-items: center;
display: flex;
}
.vh > div {
width: 100%;
text-align: center;
vertical-align: middle;
}
<div class="vh">
<div>Div to be aligned vertically</div>
</div>

Below is the Flex-box approach to get desired result
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Flex-box approach</title>
<style>
.tabs{
display: -webkit-flex;
display: flex;
width: 500px;
height: 250px;
background-color: grey;
margin: 0 auto;
}
.f{
width: 200px;
height: 200px;
margin: 20px;
background-color: yellow;
margin: 0 auto;
display: inline; /*for vertically aligning */
top: 9%; /*for vertically aligning */
position: relative; /*for vertically aligning */
}
</style>
</head>
<body>
<div class="tabs">
<div class="f">first</div>
<div class="f">second</div>
</div>
</body>
</html>

Another approach is to use table:
<div style="border:2px solid #8AC007; height:200px; width:200px;">
<table style="width:100%; height:100%">
<tr style="height:100%">
<td style="height:100%; text-align:center">hello, multiple lines here, this is super long, and that is awesome, dude</td>
</tr>
</table>
</div>

Grid css approach
#wrapper {
position: absolute;
top: 0;
bottom: 0;
right: 0;
left: 0;
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-template-rows: repeat(3, 1fr);
}
.main {
background-color: #444;
}
<div id="wrapper">
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box main"></div>
</div>

Need to follow following New and easy solution:
.centered-class {
align-items: center;
display: flex;
justify-content: center;
width: 100vw;
height: 100vh;
}
<div class="centered-class">
I'm in center vertically and horizontally.
</div>

The simplest and cleanest solution for me is using the CSS3 property "transform":
.container {
position: relative;
}
.container a {
position: absolute;
top: 50%;
transform: translate(0,-50%);
}
<div class="container">
Hello world!
</div>

In order to vertically and horizontally center an element we can also use below mentioned properties.
This CSS property aligns-items vertically and accepts the following values:
flex-start: Items align to the top of the container.
flex-end: Items align to the bottom of the container.
center: Items align at the vertical center of the container.
baseline: Items display at the baseline of the container.
stretch: Items are stretched to fit the container.
This CSS property justify-content , which aligns items horizontally and accepts the following values:
flex-start: Items align to the left side of the container.
flex-end: Items align to the right side of the container.
center: Items align at the center of the container.
space-between: Items display with equal spacing between them.
space-around: Items display with equal spacing around them.

Just make top,bottom, left and right to 0.
<html>
<head>
<style>
<div>
{
position: absolute;
margin: auto;
background-color: lightblue;
width: 100px;
height :100px;
padding: 25px;
top :0;
right :0;
bottom:0;
left:0;
}
</style>
</head>
<body>
<div> I am in the middle</div>
</body>
</html>

You can achieve this using CSS (your element display:inline-grid + grid-auto-flow: row; ) Grid and Flex Box ( parent element display:flex;),
See below snippet
#leftFrame {
display: flex;
height: 100vh;
width: 100%;
}
#tabs {
display: inline-grid;
grid-auto-flow: row;
grid-gap: 24px;
justify-items: center;
margin: auto;
}
html,body {
margin:0;
padding:0;
}
<div>
<div id=leftFrame>
<div id=tabs>
<div>first</div>
<div>second</div>
</div>
</div>
</div>

This should works
.center-div {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
text-align: center;
min-height: 100vh;
}
<div class="center-div">Center Div</div>

If you prefer it without flexbox, grid, table or vertical-align: middle;
You can do:
HTML
<div class="box">
<h2 class="box__label">square</h2>
</div>
CSS
.box {
box-sizing: border-box;
width: 100px;
height: 100px;
text-align: center;
border: 1px solid black;
}
.box__label {
box-sizing: border-box;
display: inline-block;
transform: translateY(50%);
text-align: center;
border: 1px solid black;
}

If it's only about text aligning it's simple. Just use this:
vertical-align: middle; /* vertical centering*/
text-align: center; /* horizontal centering*/
Parent styling is not needed.
In some cases when the parent has some style properties it may affect the child, where this will not work properly.

Approach 6
/*Change units to "%", "px" or whatever*/
#wrapper{
width: 50%;
height: 70vh;
background: rgba(0,0,0,.5);
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}
#left{
width: 50%;
height: 50vh;
position: absolute;
top: 0;
bottom: 0;
left: 0;
margin: auto;
background: red;
}
#right{
width: 50%;
height: 50vh;
position: absolute;
top: 0;
bottom: 0;
right: 0;
margin: auto;
background: green;
}
.txt{
text-align: center;
line-height: 50vh;
}
<div id="wrapper">
<div id="left" class="txt">Left</div>
<div id="right" class="txt">Right</div>
</div>
.container{
width: 50%; //Your container width here
height: 50%; //Your container height here
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}

The easiest way of centering a div both vertically and horizontally is as follows:
<div style="display: table; width: 200px; height: 200px; border: 1px solid black;">
<div style="display: table-cell; vertical-align: middle; text-align: center;">
Text Here
</div>
</div>
One More Example:
.parent {
display: table;
width: 100%;
height: 100%;
}
.child {
display: table-cell;
vertical-align: middle;
text-align: center;
}
<div class="parent">
<div class="child">
<h4><u>SERVICE IN BANGLADESH FLEET RESERVE <br> AND <br> RE-ENGAGEMENT ORDER FOR DEFENCE SERVICE</u></h4>
</div>
</div>

I see this the shortest and easiest way. However it depends on the element width and height. So feel free to adjust more the percentages on translate(50%, 50%);.
.divContainer {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
transform: translate(50%, 50%);
}
<div class="divContainer">I am centered</div>

The simplest flexbox approach:
The easiest way how to center a single element vertically and horizontally is to make it a flex item and set its margin to auto:
If you apply auto margins to a flex item, that item will automatically
extend its specified margin to occupy the extra space in the flex
container...
.flex-container {
height: 150px;
display: flex;
}
.flex-item {
margin: auto;
}
<div class="flex-container">
<div class="flex-item">
This should be centered!
</div>
</div>
This extension of margins in each direction will push the element exactly to the middle of its container.

In the case where I was trying to vertically align text content inside button::before and button::after, I was able to get it working using vertical-align: text-top.
button::after {
vertical-align: text-top;
}

I use this CSS code:
display: grid;
justify-content: center;
align-items: center;
The source is CSS-Tricks

This is a related problem that people might come to this page when searching: When I want to centre a div for a "waiting.." 100px square animated gif, I use:
.centreDiv {
position: absolute;
top: -moz-calc(50vh - 50px);
top: -webkit-calc(50vh - 50px);
top: calc(50vh - 50px);
left: -moz-calc(50vw - 50px);
left: -webkit-calc(50vw - 50px);
left: calc(50vw - 50px);
z-index: 1000; /* whatever is required */
}

Centering vertically an absolutely positioned iframe inside a div without having to manually set the height and width for all elements? [duplicate]

I want to center a div vertically with CSS. I don't want tables or JavaScript, but only pure CSS. I found some solutions, but all of them are missing Internet Explorer 6 support.
<body>
<div>Div to be aligned vertically</div>
</body>
How can I center a div vertically in all major browsers, including Internet Explorer 6?

Below is the best all-around solution I could build to vertically and horizontally center a fixed-width, flexible height content box. It was tested and worked for recent versions of Firefox, Opera, Chrome, and Safari.
.outer {
display: table;
position: absolute;
top: 0;
left: 0;
height: 100%;
width: 100%;
}
.middle {
display: table-cell;
vertical-align: middle;
}
.inner {
margin-left: auto;
margin-right: auto;
width: 400px;
/* Whatever width you want */
}
<div class="outer">
<div class="middle">
<div class="inner">
<h1>The Content</h1>
<p>Once upon a midnight dreary...</p>
</div>
</div>
</div>
View A Working Example With Dynamic Content
I built in some dynamic content to test the flexibility and would love to know if anyone sees any problems with it. It should work well for centered overlays also -- lightbox, pop-up, etc.

The simplest way would be the following three lines of CSS:
1) position: relative;
2) top: 50%;
3) transform: translateY(-50%);
Following is an example:
div.outer-div {
height: 170px;
width: 300px;
background-color: lightgray;
}
div.middle-div {
position: relative;
top: 50%;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
}
<div class='outer-div'>
<div class='middle-div'>
Test text
</div>
</div>

One more I can't see on the list:
.Center-Container {
position: relative;
height: 100%;
}
.Absolute-Center {
width: 50%;
height: 50%;
overflow: auto;
margin: auto;
position: absolute;
top: 0; left: 0; bottom: 0; right: 0;
border: solid black;
}
Cross-browser (including Internet Explorer 8 - Internet Explorer 10 without hacks!)
Responsive with percentages and min-/max-
Centered regardless of padding (without box-sizing!)
height must be declared (see Variable Height)
Recommended setting overflow: auto to prevent content spillover (see Overflow)
Source: Absolute Horizontal And Vertical Centering In CSS

Now the Flexbox solution is a very easy way for modern browsers, so I recommend this for you:
.container {
display: flex;
align-items: center;
justify-content: center;
height: 100%;
background: green;
}
body,
html {
height: 100%;
}
<div class="container">
<div>Div to be aligned vertically</div>
</div>

Actually, you need two div's for vertical centering. The div containing the content must have a width and height.
#container {
position: absolute;
top: 50%;
margin-top: -200px;
/* Half of #content height */
left: 0;
width: 100%;
}
#content {
width: 624px;
margin-left: auto;
margin-right: auto;
height: 395px;
border: 1px solid #000000;
}
<div id="container">
<div id="content">
<h1>Centered div</h1>
</div>
</div>
Here is the result.

Edit 2020: only use this if you need to support old browsers like Internet Explorer 8 (which you should refuse to do 😉). If not, use Flexbox.
This is the simplest method I found and I use it all the time
(jsFiddle demo here).
Thank Chris Coyier from CSS Tricks for this article.
html, body{
height: 100%;
margin: 0;
}
.v-wrap{
height: 100%;
white-space: nowrap;
text-align: center;
}
.v-wrap:before{
content: "";
display: inline-block;
vertical-align: middle;
width: 0;
/* adjust for white space between pseudo element and next sibling */
margin-right: -.25em;
/* stretch line height */
height: 100%;
}
.v-box{
display: inline-block;
vertical-align: middle;
white-space: normal;
}
<div class="v-wrap">
<article class="v-box">
<p>This is how I've been doing it for some time</p>
</article>
</div>
Support starts with Internet Explorer 8.

After a lot of research I finally found the ultimate solution. It works even for floated elements. View Source
.element {
position: relative;
top: 50%;
transform: translateY(-50%); /* or try 50% */
}

Use the CSS Flexbox align-items property to achieve this.
html, body {
height: 100%;
}
body {
display: flex;
align-items: center;
}
<div>This is centered vertically</div>

To center the div on a page, check the fiddle link.
#vh {
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
.box{
border-radius: 15px;
box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
padding: 25px;
width: 100px;
height: 100px;
background: white;
}
<div id="vh" class="box">Div to be aligned vertically</div>
Another option is to use flex box, check the fiddle link.
.vh {
background-color: #ddd;
height: 400px;
align-items: center;
display: flex;
}
.vh > div {
width: 100%;
text-align: center;
vertical-align: middle;
}
<div class="vh">
<div>Div to be aligned vertically</div>
</div>
Another option is to use a CSS 3 transform:
#vh {
position: absolute;
top: 50%;
left: 50%;
/*transform: translateX(-50%) translateY(-50%);*/
transform: translate(-50%, -50%);
}
.box{
border-radius: 15px;
box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
padding: 25px;
width: 100px;
height: 100px;
background: white;
}
<div id="vh" class="box">Div to be aligned vertically</div>

The easiest solution is below:
.outer-div{
width: 100%;
height: 200px;
display: flex;
border:1px solid #000;
}
.inner-div{
margin: auto;
text-align: center;
border: 1px solid red;
}
<div class="outer-div">
<div class="inner-div">
Hey there!
</div>
</div>

There are multiple ways to achieve this.
Using flex property of CSS.
Solution #1
.parent {
width: 400px;
height:200px;
background: blue;
display: flex;
align-items: center;
justify-content:center;
}
.child {
width: 75px;
height: 75px;
background: yellow;
}
<div class="parent">
<div class="child"></div>
</div>
or by using display: flex; and margin: auto;
Solution #2
.parent {
width: 400px;
height:200px;
background: blue;
display: flex;
}
.child {
width: 75px;
height: 75px;
background: yellow;
margin:auto;
}
<div class="parent">
<div class="child"></div>
</div>
show text center
Solution #3
.parent {
width: 400px;
height: 200px;
background: yellow;
display: flex;
align-items: center;
justify-content:center;
}
<div class="parent">Center</div>
Using percentage(%) height and width.
Solution #4
.parent {
position: absolute;
height:100%;
width:100%;
background: blue;
display: flex;
align-items: center;
justify-content:center;
}
.child {
width: 75px;
height: 75px;
background: yellow;
}
<div class="parent">
<div class="child"></div>
</div>

Unfortunately — but not surprisingly — the solution is more complicated than one would wish it to be. Also unfortunately, you'll need to use additional divs around the div you want vertically centered.
For standards-compliant browsers like Mozilla, Opera, Safari, etc. you need to set the outer div to be displayed as a table and the inner div to be displayed as a table-cell — which can then be vertically centered. For Internet Explorer, you need to position the inner div absolutely within the outer div and then specify the top as 50%. The following pages explain this technique well and provide some code samples too:
Vertical Centering in CSS
Vertical Centering in CSS with Unknown Height (Internet Explorer 7 compatible) (Archived article courtesy of the Wayback Machine)
There is also a technique to do the vertical centering using JavaScript. Vertical alignment of content with JavaScript & CSS demonstrates it.

If someone cares for Internet Explorer 10 (and later) only, use Flexbox:
.parent {
width: 500px;
height: 500px;
background: yellow;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
}
.centered {
width: 100px;
height: 100px;
background: blue;
}
<div class="parent">
<div class="centered"></div>
</div>
Flexbox support: http://caniuse.com/flexbox

A modern way to center an element vertically would be to use flexbox.
You need a parent to decide the height and a child to center.
The example below will center a div to the center within your browser. What's important (in my example) is to set height: 100% to body and html and then min-height: 100% to your container.
body, html {
background: #F5F5F5;
box-sizing: border-box;
height: 100%;
margin: 0;
}
#center_container {
align-items: center;
display: flex;
min-height: 100%;
}
#center {
background: white;
margin: 0 auto;
padding: 10px;
text-align: center;
width: 200px;
}
<div id='center_container'>
<div id='center'>I am center.</div>
</div>

.center {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%); /* (x, y) => position */
-ms-transform: translate(-50%, -50%); /* IE 9 */
-webkit-transform: translate(-50%, -50%); /* Chrome, Safari, Opera */
}
.vertical {
position: absolute;
top: 50%;
//left: 0;
transform: translate(0, -50%); /* (x, y) => position */
}
.horizontal {
position: absolute;
//top: 0;
left: 50%;
transform: translate(-50%, 0); /* (x, y) => position */
}
div {
padding: 1em;
background-color: grey;
color: white;
}
<body>
<div class="vertical">Vertically left</div>
<div class="horizontal">Horizontal top</div>
<div class="center">Vertically Horizontal</div>
</body>
Related: Center a Image

Centering only vertically
If you don't care about Internet Explorer 6 and 7, you can use a technique that involves two containers.
The outer container:
should have display: table;
The inner container:
should have display: table-cell;
should have vertical-align: middle;
The content box:
should have display: inline-block;
You can add any content you want to the content box without caring about its width or height!
Demo:
body {
margin: 0;
}
.outer-container {
position: absolute;
display: table;
width: 100%; /* This could be ANY width */
height: 100%; /* This could be ANY height */
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
}
.centered-content {
display: inline-block;
background: #fff;
padding: 20px;
border: 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Malcolm in the Middle
</div>
</div>
</div>
See also this Fiddle!
Centering horizontally and vertically
If you want to center both horizontally and vertically, you also need the following.
The inner container:
should have text-align: center;
The content box:
should re-adjust the horizontal text-alignment to for example text-align: left; or text-align: right;, unless you want text to be centered
Demo:
body {
margin: 0;
}
.outer-container {
position: absolute;
display: table;
width: 100%; /* This could be ANY width */
height: 100%; /* This could be ANY height */
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding: 20px;
border: 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Malcolm in the Middle
</div>
</div>
</div>
See also this Fiddle!

It can be done in two ways
body{
left: 50%;
top:50%;
transform: translate(-50%, -50%);
height: 100%;
width: 100%;
}
OR
Using flex
body {
height:100%
width:100%
display: flex;
justify-content: center;
align-items: center;
}
align-items:center; makes the content vertically center
justify-content: center;makes the content horizontally center

This is always where I go when I have to come back to this issue.
For those who don't want to make the jump:
Specify the parent container as position:relative or position:absolute.
Specify a fixed height on the child container.
Set position:absolute and top:50% on the child container to move the top down to the middle of the parent.
Set margin-top:-yy where yy is half the height of the child container to offset the item up.
An example of this in code:
<style type="text/css">
#myoutercontainer {position:relative}
#myinnercontainer {position:absolute; top:50%; height:10em; margin-top:-5em}
</style>
...
<div id="myoutercontainer">
<div id="myinnercontainer">
<p>Hey look! I'm vertically centered!</p>
<p>How sweet is this?!</p>
</div>
</div>

I just wrote this CSS and to know more, please go through: This article with vertical align anything with just 3 lines of CSS.
.element {
position: relative;
top: 50%;
transform: perspective(1px) translateY(-50%);
}

For newcomers, please try:
display: flex;
align-items: center;
justify-content: center;

The three lines of code using transform works practically on modern browsers and Internet Explorer:
.element{
position: relative;
top: 50%;
transform: translateY(-50%);
-moz-transform: translateY(-50%);
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
}
I am adding this answer since I found some incompleteness in the previous version of this answer (and Stack Overflow won't allow me to simply comment).
'position' relative messes up the styling if the current div is in the body and has no container div. However 'fixed' seems to work, but it obviously fixes the content in the center of the viewport
Also I used this styling for centering some overlay divs and found that in Mozilla all elements inside this transformed div had lost their bottom borders. Possibly a rendering issue. But adding just the minimal padding to some of them rendered it correctly. Chrome and Internet Explorer (surprisingly) rendered the boxes without any need for padding

CSS Grid
body, html { margin: 0; }
body {
display: grid;
min-height: 100vh;
align-items: center;
}
<div>Div to be aligned vertically</div>

.center{
display: grid;
place-items: center;
}

The answer from Billbad only works with a fixed width of the .inner div.
This solution works for a dynamic width by adding the attribute text-align: center to the .outer div.
.outer {
position: absolute;
display: table;
width: 100%;
height: 100%;
text-align: center;
}
.middle {
display: table-cell;
vertical-align: middle;
}
.inner {
text-align: center;
display: inline-block;
width: auto;
}
<div class="outer">
<div class="middle">
<div class="inner">
Content
</div>
</div>
</div>

Just do it: Add the class at your div:
.modal {
margin: auto;
position: absolute;
top: 0;
right: 0;
left: 0;
bottom: 0;
height: 240px;
}
And read this article for an explanation. Note: Height is necessary.

I did it with this (change width, height, margin-top and margin-left accordingly):
.wrapper {
width: 960px;
height: 590px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -295px;
margin-left: -480px;
}
<div class="wrapper"> -- Content -- </div>

Not answering for browser compatibility but to also mention the new Grid and the not so new Flexbox feature.
Grid
From: Mozilla - Grid Documentation - Align Div Vertically
Browser Support: Grid Browser Support
CSS:
.wrapper {
display: grid;
grid-template-columns: repeat(4, 1fr);
grid-gap: 10px;
grid-auto-rows: 200px;
grid-template-areas:
". a a ."
". a a .";
}
.item1 {
grid-area: a;
align-self: center;
justify-self: center;
}
HTML:
<div class="wrapper">
<div class="item1">Item 1</div>
</div>
Flexbox
Browser Support: Flexbox Browser Support
CSS:
display: -webkit-box;
display: -moz-box;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
align-items: center;
justify-content: center;

I think a solid solution for all browsers without using Flexbox - "align-items: center;" is a combination of display: table and vertical-align: middle;.
CSS
.vertically-center
{
display: table;
width: 100%; /* Optional */
height: 100%; /* Optional */
}
.vertically-center > div
{
display: table-cell;
vertical-align: middle;
}
HTML
<div class="vertically-center">
<div>
<div style="border: 1px solid black;">some text</div>
</div>
</div>
‣Demo: https://jsfiddle.net/6m640rpp/

Especially for parent divs with relative (unknown) height, the centering in the unknown solution works great for me. There are some really nice code examples in the article.
It was tested in Chrome, Firefox, Opera, and Internet Explorer.
/* This parent can be any width and height */
.block {
text-align: center;
}
/* The ghost, nudged to maintain perfect centering */
.block:before {
content: '';
display: inline-block;
height: 100%;
vertical-align: middle;
margin-right: -0.25em; /* Adjusts for spacing */
}
/* The element to be centered, can
also be of any width and height */
.centered {
display: inline-block;
vertical-align: middle;
width: 300px;
}
<div style="width: 400px; height: 200px;">
<div class="block" style="height: 90%; width: 100%">
<div class="centered">
<h1>Some text</h1>
<p>Any other text..."</p>
</div>
</div>
</div>

There is a trick I found out recently: You need to use top 50%, and then you do a translateY(-50%).
.outer-div {
position: relative;
height: 150px;
width: 150px;
background-color: red;
}
.centered-div {
position: absolute;
top: 50%;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
background-color: white;
}
<div class='outer-div'>
<div class='centered-div'>
Test text
</div>
</div>

Center by absolute position work fine in Chrome but not in latest versions of IE and Firefox [duplicate]

I want to center a div vertically with CSS. I don't want tables or JavaScript, but only pure CSS. I found some solutions, but all of them are missing Internet Explorer 6 support.
<body>
<div>Div to be aligned vertically</div>
</body>
How can I center a div vertically in all major browsers, including Internet Explorer 6?

Below is the best all-around solution I could build to vertically and horizontally center a fixed-width, flexible height content box. It was tested and worked for recent versions of Firefox, Opera, Chrome, and Safari.
.outer {
display: table;
position: absolute;
top: 0;
left: 0;
height: 100%;
width: 100%;
}
.middle {
display: table-cell;
vertical-align: middle;
}
.inner {
margin-left: auto;
margin-right: auto;
width: 400px;
/* Whatever width you want */
}
<div class="outer">
<div class="middle">
<div class="inner">
<h1>The Content</h1>
<p>Once upon a midnight dreary...</p>
</div>
</div>
</div>
View A Working Example With Dynamic Content
I built in some dynamic content to test the flexibility and would love to know if anyone sees any problems with it. It should work well for centered overlays also -- lightbox, pop-up, etc.

The simplest way would be the following three lines of CSS:
1) position: relative;
2) top: 50%;
3) transform: translateY(-50%);
Following is an example:
div.outer-div {
height: 170px;
width: 300px;
background-color: lightgray;
}
div.middle-div {
position: relative;
top: 50%;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
}
<div class='outer-div'>
<div class='middle-div'>
Test text
</div>
</div>

One more I can't see on the list:
.Center-Container {
position: relative;
height: 100%;
}
.Absolute-Center {
width: 50%;
height: 50%;
overflow: auto;
margin: auto;
position: absolute;
top: 0; left: 0; bottom: 0; right: 0;
border: solid black;
}
Cross-browser (including Internet Explorer 8 - Internet Explorer 10 without hacks!)
Responsive with percentages and min-/max-
Centered regardless of padding (without box-sizing!)
height must be declared (see Variable Height)
Recommended setting overflow: auto to prevent content spillover (see Overflow)
Source: Absolute Horizontal And Vertical Centering In CSS

Now the Flexbox solution is a very easy way for modern browsers, so I recommend this for you:
.container {
display: flex;
align-items: center;
justify-content: center;
height: 100%;
background: green;
}
body,
html {
height: 100%;
}
<div class="container">
<div>Div to be aligned vertically</div>
</div>

Actually, you need two div's for vertical centering. The div containing the content must have a width and height.
#container {
position: absolute;
top: 50%;
margin-top: -200px;
/* Half of #content height */
left: 0;
width: 100%;
}
#content {
width: 624px;
margin-left: auto;
margin-right: auto;
height: 395px;
border: 1px solid #000000;
}
<div id="container">
<div id="content">
<h1>Centered div</h1>
</div>
</div>
Here is the result.

Edit 2020: only use this if you need to support old browsers like Internet Explorer 8 (which you should refuse to do 😉). If not, use Flexbox.
This is the simplest method I found and I use it all the time
(jsFiddle demo here).
Thank Chris Coyier from CSS Tricks for this article.
html, body{
height: 100%;
margin: 0;
}
.v-wrap{
height: 100%;
white-space: nowrap;
text-align: center;
}
.v-wrap:before{
content: "";
display: inline-block;
vertical-align: middle;
width: 0;
/* adjust for white space between pseudo element and next sibling */
margin-right: -.25em;
/* stretch line height */
height: 100%;
}
.v-box{
display: inline-block;
vertical-align: middle;
white-space: normal;
}
<div class="v-wrap">
<article class="v-box">
<p>This is how I've been doing it for some time</p>
</article>
</div>
Support starts with Internet Explorer 8.

After a lot of research I finally found the ultimate solution. It works even for floated elements. View Source
.element {
position: relative;
top: 50%;
transform: translateY(-50%); /* or try 50% */
}

Use the CSS Flexbox align-items property to achieve this.
html, body {
height: 100%;
}
body {
display: flex;
align-items: center;
}
<div>This is centered vertically</div>

To center the div on a page, check the fiddle link.
#vh {
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
.box{
border-radius: 15px;
box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
padding: 25px;
width: 100px;
height: 100px;
background: white;
}
<div id="vh" class="box">Div to be aligned vertically</div>
Another option is to use flex box, check the fiddle link.
.vh {
background-color: #ddd;
height: 400px;
align-items: center;
display: flex;
}
.vh > div {
width: 100%;
text-align: center;
vertical-align: middle;
}
<div class="vh">
<div>Div to be aligned vertically</div>
</div>
Another option is to use a CSS 3 transform:
#vh {
position: absolute;
top: 50%;
left: 50%;
/*transform: translateX(-50%) translateY(-50%);*/
transform: translate(-50%, -50%);
}
.box{
border-radius: 15px;
box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
padding: 25px;
width: 100px;
height: 100px;
background: white;
}
<div id="vh" class="box">Div to be aligned vertically</div>

The easiest solution is below:
.outer-div{
width: 100%;
height: 200px;
display: flex;
border:1px solid #000;
}
.inner-div{
margin: auto;
text-align: center;
border: 1px solid red;
}
<div class="outer-div">
<div class="inner-div">
Hey there!
</div>
</div>

There are multiple ways to achieve this.
Using flex property of CSS.
Solution #1
.parent {
width: 400px;
height:200px;
background: blue;
display: flex;
align-items: center;
justify-content:center;
}
.child {
width: 75px;
height: 75px;
background: yellow;
}
<div class="parent">
<div class="child"></div>
</div>
or by using display: flex; and margin: auto;
Solution #2
.parent {
width: 400px;
height:200px;
background: blue;
display: flex;
}
.child {
width: 75px;
height: 75px;
background: yellow;
margin:auto;
}
<div class="parent">
<div class="child"></div>
</div>
show text center
Solution #3
.parent {
width: 400px;
height: 200px;
background: yellow;
display: flex;
align-items: center;
justify-content:center;
}
<div class="parent">Center</div>
Using percentage(%) height and width.
Solution #4
.parent {
position: absolute;
height:100%;
width:100%;
background: blue;
display: flex;
align-items: center;
justify-content:center;
}
.child {
width: 75px;
height: 75px;
background: yellow;
}
<div class="parent">
<div class="child"></div>
</div>

Unfortunately — but not surprisingly — the solution is more complicated than one would wish it to be. Also unfortunately, you'll need to use additional divs around the div you want vertically centered.
For standards-compliant browsers like Mozilla, Opera, Safari, etc. you need to set the outer div to be displayed as a table and the inner div to be displayed as a table-cell — which can then be vertically centered. For Internet Explorer, you need to position the inner div absolutely within the outer div and then specify the top as 50%. The following pages explain this technique well and provide some code samples too:
Vertical Centering in CSS
Vertical Centering in CSS with Unknown Height (Internet Explorer 7 compatible) (Archived article courtesy of the Wayback Machine)
There is also a technique to do the vertical centering using JavaScript. Vertical alignment of content with JavaScript & CSS demonstrates it.

If someone cares for Internet Explorer 10 (and later) only, use Flexbox:
.parent {
width: 500px;
height: 500px;
background: yellow;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
}
.centered {
width: 100px;
height: 100px;
background: blue;
}
<div class="parent">
<div class="centered"></div>
</div>
Flexbox support: http://caniuse.com/flexbox

A modern way to center an element vertically would be to use flexbox.
You need a parent to decide the height and a child to center.
The example below will center a div to the center within your browser. What's important (in my example) is to set height: 100% to body and html and then min-height: 100% to your container.
body, html {
background: #F5F5F5;
box-sizing: border-box;
height: 100%;
margin: 0;
}
#center_container {
align-items: center;
display: flex;
min-height: 100%;
}
#center {
background: white;
margin: 0 auto;
padding: 10px;
text-align: center;
width: 200px;
}
<div id='center_container'>
<div id='center'>I am center.</div>
</div>

.center {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%); /* (x, y) => position */
-ms-transform: translate(-50%, -50%); /* IE 9 */
-webkit-transform: translate(-50%, -50%); /* Chrome, Safari, Opera */
}
.vertical {
position: absolute;
top: 50%;
//left: 0;
transform: translate(0, -50%); /* (x, y) => position */
}
.horizontal {
position: absolute;
//top: 0;
left: 50%;
transform: translate(-50%, 0); /* (x, y) => position */
}
div {
padding: 1em;
background-color: grey;
color: white;
}
<body>
<div class="vertical">Vertically left</div>
<div class="horizontal">Horizontal top</div>
<div class="center">Vertically Horizontal</div>
</body>
Related: Center a Image

Centering only vertically
If you don't care about Internet Explorer 6 and 7, you can use a technique that involves two containers.
The outer container:
should have display: table;
The inner container:
should have display: table-cell;
should have vertical-align: middle;
The content box:
should have display: inline-block;
You can add any content you want to the content box without caring about its width or height!
Demo:
body {
margin: 0;
}
.outer-container {
position: absolute;
display: table;
width: 100%; /* This could be ANY width */
height: 100%; /* This could be ANY height */
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
}
.centered-content {
display: inline-block;
background: #fff;
padding: 20px;
border: 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Malcolm in the Middle
</div>
</div>
</div>
See also this Fiddle!
Centering horizontally and vertically
If you want to center both horizontally and vertically, you also need the following.
The inner container:
should have text-align: center;
The content box:
should re-adjust the horizontal text-alignment to for example text-align: left; or text-align: right;, unless you want text to be centered
Demo:
body {
margin: 0;
}
.outer-container {
position: absolute;
display: table;
width: 100%; /* This could be ANY width */
height: 100%; /* This could be ANY height */
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding: 20px;
border: 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Malcolm in the Middle
</div>
</div>
</div>
See also this Fiddle!

It can be done in two ways
body{
left: 50%;
top:50%;
transform: translate(-50%, -50%);
height: 100%;
width: 100%;
}
OR
Using flex
body {
height:100%
width:100%
display: flex;
justify-content: center;
align-items: center;
}
align-items:center; makes the content vertically center
justify-content: center;makes the content horizontally center

This is always where I go when I have to come back to this issue.
For those who don't want to make the jump:
Specify the parent container as position:relative or position:absolute.
Specify a fixed height on the child container.
Set position:absolute and top:50% on the child container to move the top down to the middle of the parent.
Set margin-top:-yy where yy is half the height of the child container to offset the item up.
An example of this in code:
<style type="text/css">
#myoutercontainer {position:relative}
#myinnercontainer {position:absolute; top:50%; height:10em; margin-top:-5em}
</style>
...
<div id="myoutercontainer">
<div id="myinnercontainer">
<p>Hey look! I'm vertically centered!</p>
<p>How sweet is this?!</p>
</div>
</div>

I just wrote this CSS and to know more, please go through: This article with vertical align anything with just 3 lines of CSS.
.element {
position: relative;
top: 50%;
transform: perspective(1px) translateY(-50%);
}

For newcomers, please try:
display: flex;
align-items: center;
justify-content: center;

The three lines of code using transform works practically on modern browsers and Internet Explorer:
.element{
position: relative;
top: 50%;
transform: translateY(-50%);
-moz-transform: translateY(-50%);
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
}
I am adding this answer since I found some incompleteness in the previous version of this answer (and Stack Overflow won't allow me to simply comment).
'position' relative messes up the styling if the current div is in the body and has no container div. However 'fixed' seems to work, but it obviously fixes the content in the center of the viewport
Also I used this styling for centering some overlay divs and found that in Mozilla all elements inside this transformed div had lost their bottom borders. Possibly a rendering issue. But adding just the minimal padding to some of them rendered it correctly. Chrome and Internet Explorer (surprisingly) rendered the boxes without any need for padding

CSS Grid
body, html { margin: 0; }
body {
display: grid;
min-height: 100vh;
align-items: center;
}
<div>Div to be aligned vertically</div>

.center{
display: grid;
place-items: center;
}

The answer from Billbad only works with a fixed width of the .inner div.
This solution works for a dynamic width by adding the attribute text-align: center to the .outer div.
.outer {
position: absolute;
display: table;
width: 100%;
height: 100%;
text-align: center;
}
.middle {
display: table-cell;
vertical-align: middle;
}
.inner {
text-align: center;
display: inline-block;
width: auto;
}
<div class="outer">
<div class="middle">
<div class="inner">
Content
</div>
</div>
</div>

Just do it: Add the class at your div:
.modal {
margin: auto;
position: absolute;
top: 0;
right: 0;
left: 0;
bottom: 0;
height: 240px;
}
And read this article for an explanation. Note: Height is necessary.

I did it with this (change width, height, margin-top and margin-left accordingly):
.wrapper {
width: 960px;
height: 590px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -295px;
margin-left: -480px;
}
<div class="wrapper"> -- Content -- </div>

Not answering for browser compatibility but to also mention the new Grid and the not so new Flexbox feature.
Grid
From: Mozilla - Grid Documentation - Align Div Vertically
Browser Support: Grid Browser Support
CSS:
.wrapper {
display: grid;
grid-template-columns: repeat(4, 1fr);
grid-gap: 10px;
grid-auto-rows: 200px;
grid-template-areas:
". a a ."
". a a .";
}
.item1 {
grid-area: a;
align-self: center;
justify-self: center;
}
HTML:
<div class="wrapper">
<div class="item1">Item 1</div>
</div>
Flexbox
Browser Support: Flexbox Browser Support
CSS:
display: -webkit-box;
display: -moz-box;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
align-items: center;
justify-content: center;

I think a solid solution for all browsers without using Flexbox - "align-items: center;" is a combination of display: table and vertical-align: middle;.
CSS
.vertically-center
{
display: table;
width: 100%; /* Optional */
height: 100%; /* Optional */
}
.vertically-center > div
{
display: table-cell;
vertical-align: middle;
}
HTML
<div class="vertically-center">
<div>
<div style="border: 1px solid black;">some text</div>
</div>
</div>
‣Demo: https://jsfiddle.net/6m640rpp/

Especially for parent divs with relative (unknown) height, the centering in the unknown solution works great for me. There are some really nice code examples in the article.
It was tested in Chrome, Firefox, Opera, and Internet Explorer.
/* This parent can be any width and height */
.block {
text-align: center;
}
/* The ghost, nudged to maintain perfect centering */
.block:before {
content: '';
display: inline-block;
height: 100%;
vertical-align: middle;
margin-right: -0.25em; /* Adjusts for spacing */
}
/* The element to be centered, can
also be of any width and height */
.centered {
display: inline-block;
vertical-align: middle;
width: 300px;
}
<div style="width: 400px; height: 200px;">
<div class="block" style="height: 90%; width: 100%">
<div class="centered">
<h1>Some text</h1>
<p>Any other text..."</p>
</div>
</div>
</div>

There is a trick I found out recently: You need to use top 50%, and then you do a translateY(-50%).
.outer-div {
position: relative;
height: 150px;
width: 150px;
background-color: red;
}
.centered-div {
position: absolute;
top: 50%;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
background-color: white;
}
<div class='outer-div'>
<div class='centered-div'>
Test text
</div>
</div>

Center text vertically in a div with height 50% [duplicate]

I am trying to center my tabs content vertically, but when I add the CSS style display:inline-flex, the horizontal text-align disappears.
How can I make both text alignments x and y for each of my tabs?
* { box-sizing: border-box; }
#leftFrame {
background-color: green;
position: absolute;
left: 0;
right: 60%;
top: 0;
bottom: 0;
}
#leftFrame #tabs {
background-color: red;
position: absolute;
top: 0;
left: 0;
right: 0;
height: 25%;
}
#leftFrame #tabs div {
border: 2px solid black;
position: static;
float: left;
width: 50%;
height: 100%;
text-align: center;
display: inline-flex;
align-items: center;
}
<div id=leftFrame>
<div id=tabs>
<div>first</div>
<div>second</div>
</div>
</div>

Approach 1 - transform translateX/translateY:
Example Here / Full Screen Example
In supported browsers (most of them), you can use top: 50%/left: 50% in combination with translateX(-50%) translateY(-50%) to dynamically vertically/horizontally center the element.
.container {
position: absolute;
top: 50%;
left: 50%;
-moz-transform: translateX(-50%) translateY(-50%);
-webkit-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
}
<div class="container">
<span>I'm vertically/horizontally centered!</span>
</div>
Approach 2 - Flexbox method:
Example Here / Full Screen Example
In supported browsers, set the display of the targeted element to flex and use align-items: center for vertical centering and justify-content: center for horizontal centering. Just don't forget to add vendor prefixes for additional browser support (see example). Remember the parent container will also need height (in this case, 100%).
html, body, .container {
height: 100%;
}
.container {
display: -webkit-flexbox;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
-webkit-flex-align: center;
-ms-flex-align: center;
-webkit-align-items: center;
align-items: center;
justify-content: center;
}
<div class="container">
<span>I'm vertically/horizontally centered!</span>
</div>
Approach 3 - table-cell/vertical-align: middle:
Example Here / Full Screen Example
In some cases, you will need to ensure that the html/body element's height is set to 100%.
For vertical alignment, set the parent element's width/height to 100% and add display: table. Then for the child element, change the display to table-cell and add vertical-align: middle.
For horizontal centering, you could either add text-align: center to center the text and any other inline children elements. Alternatively, you could use margin: 0 auto, assuming the element is block level.
html, body {
height: 100%;
}
.parent {
width: 100%;
height: 100%;
display: table;
text-align: center;
}
.parent > .child {
display: table-cell;
vertical-align: middle;
}
<section class="parent">
<div class="child">I'm vertically/horizontally centered!</div>
</section>
Approach 4 - Absolutely positioned 50% from the top with displacement:
Example Here / Full Screen Example
This approach assumes that the text has a known height - in this instance, 18px. Just absolutely position the element 50% from the top, relative to the parent element. Use a negative margin-top value that is half of the element's known height, in this case - -9px.
html, body, .container {
height: 100%;
}
.container {
position: relative;
text-align: center;
}
.container > p {
position: absolute;
top: 50%;
left: 0;
right: 0;
margin-top: -9px;
}
<div class="container">
<p>I'm vertically/horizontally centered!</p>
</div>
Approach 5 - The line-height method (Least flexible - not suggested):
Example Here
In some cases, the parent element will have a fixed height. For vertical centering, all you have to do is set a line-height value on the child element equal to the fixed height of the parent element.
Though this solution will work in some cases, it's worth noting that it won't work when there are multiple lines of text - like this.
.parent {
height: 200px;
width: 400px;
background: lightgray;
text-align: center;
}
.parent > .child {
line-height: 200px;
}
<div class="parent">
<span class="child">I'm vertically/horizontally centered!</span>
</div>

If CSS3 is an option (or you have a fallback) you can use transform:
.center {
right: 50%;
bottom: 50%;
transform: translate(50%,50%);
position: absolute;
}
Unlike the first approach above, you don't want to use left:50% with the negative translation because there's an overflow bug in IE9+. Utilize a positive right value and you won't see horizontal scrollbars.

Here is how to use two simple flexbox properties to center n divs on the two axes:
Set the height of your container: Here the body is set to be at least 100 viewport height.
align-items: center; will center the blocks vertically if flex direction is row else horizontally if flex direction is column
justify-content: space-around; will distribute the free space vertically if flex direction is row else horizontally if flex direction is column around the div elements
body {
min-height: 100vh;
display: flex;
align-items: center;
justify-content: space-around;
}
<div>foo</div>
<div>bar</div>

The best way to center a box both vertically and horizontally, is to use two containers :
The outher container :
should have display: table;
The inner container :
should have display: table-cell;
should have vertical-align: middle;
should have text-align: center;
The content box :
should have display: inline-block;
should adjust the horizontal text-alignment, unless you want text to be centered
Demo :
body {
margin : 0;
}
.outer-container {
display: table;
width: 80%;
height: 120px;
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding : 20px;
border : 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Center this!
</div>
</div>
</div>
See also this Fiddle!
Centering in the middle of the page:
To center your content in the middle of your page, add the following to your outer container :
position : absolute;
width: 100%;
height: 100%;
Here's a demo for that :
body {
margin : 0;
}
.outer-container {
position : absolute;
display: table;
width: 100%;
height: 100%;
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding : 20px;
border : 1px solid #000;
}
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
Center this!
</div>
</div>
</div>
See also this Fiddle!

CSS Grid: place-items
Finally, we have place-items: center for CSS Grid to make it easier.
HTML
<div class="parent">
<div class="to-center"></div>
</div>
CSS
.parent {
display: grid;
place-items: center;
}
Output:
html,
body {
height: 100%;
}
.container {
display: grid;
place-items: center;
height: 100%;
}
.center {
background: #5F85DB;
color: #fff;
font-weight: bold;
font-family: Tahoma;
padding: 10px;
}
<div class="container">
<div class="center" contenteditable>I am always super centered within my parent</div>
</div>

Run this code snippet and see a vertically and horizontally aligned div.
html,
body,
.container {
height: 100%;
width: 100%;
}
.container {
display: flex;
align-items: center;
justify-content: center;
}
.mydiv {
width: 80px;
}
<div class="container">
<div class="mydiv">h & v aligned</div>
</div>

.align {
display: flex;
width: 400px;
height: 400px;
border: solid 1px black;
align-items: center;
justify-content: space-around;
}
.align div:first-child {
width: 20px;
height: 20px;
background-color: red;
position: absolute;
}
.align div {
width: 20px;
height: 20px;
background-color: blue;
}
<div class='align'>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
First child will be aligned vertically and horizontally at center

Source Link
Method 1) Display type flex
.child-element{
display: flex;
justify-content: center;
align-items: center;
}
Method 2) 2D Transform
.child-element {
top: 50%;
left: 50%;
transform: translate(-50% , -50%);
position: absolute;
}
See other methods here

to center the Div in a page check the fiddle link
#vh {
border-radius: 15px;
box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
padding: 25px;
width: 200px;
height: 200px;
background: white;
text-align: center;
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
<div id="vh">Div to be aligned vertically</div>
Update
Another option is to use flex box check the fiddle link
.vh {
background-color: #ddd;
height: 200px;
align-items: center;
display: flex;
}
.vh > div {
width: 100%;
text-align: center;
vertical-align: middle;
}
<div class="vh">
<div>Div to be aligned vertically</div>
</div>

Below is the Flex-box approach to get desired result
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Flex-box approach</title>
<style>
.tabs{
display: -webkit-flex;
display: flex;
width: 500px;
height: 250px;
background-color: grey;
margin: 0 auto;
}
.f{
width: 200px;
height: 200px;
margin: 20px;
background-color: yellow;
margin: 0 auto;
display: inline; /*for vertically aligning */
top: 9%; /*for vertically aligning */
position: relative; /*for vertically aligning */
}
</style>
</head>
<body>
<div class="tabs">
<div class="f">first</div>
<div class="f">second</div>
</div>
</body>
</html>

Another approach is to use table:
<div style="border:2px solid #8AC007; height:200px; width:200px;">
<table style="width:100%; height:100%">
<tr style="height:100%">
<td style="height:100%; text-align:center">hello, multiple lines here, this is super long, and that is awesome, dude</td>
</tr>
</table>
</div>

Grid css approach
#wrapper {
position: absolute;
top: 0;
bottom: 0;
right: 0;
left: 0;
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-template-rows: repeat(3, 1fr);
}
.main {
background-color: #444;
}
<div id="wrapper">
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box main"></div>
</div>

Need to follow following New and easy solution:
.centered-class {
align-items: center;
display: flex;
justify-content: center;
width: 100vw;
height: 100vh;
}
<div class="centered-class">
I'm in center vertically and horizontally.
</div>

The simplest and cleanest solution for me is using the CSS3 property "transform":
.container {
position: relative;
}
.container a {
position: absolute;
top: 50%;
transform: translate(0,-50%);
}
<div class="container">
Hello world!
</div>

In order to vertically and horizontally center an element we can also use below mentioned properties.
This CSS property aligns-items vertically and accepts the following values:
flex-start: Items align to the top of the container.
flex-end: Items align to the bottom of the container.
center: Items align at the vertical center of the container.
baseline: Items display at the baseline of the container.
stretch: Items are stretched to fit the container.
This CSS property justify-content , which aligns items horizontally and accepts the following values:
flex-start: Items align to the left side of the container.
flex-end: Items align to the right side of the container.
center: Items align at the center of the container.
space-between: Items display with equal spacing between them.
space-around: Items display with equal spacing around them.

Just make top,bottom, left and right to 0.
<html>
<head>
<style>
<div>
{
position: absolute;
margin: auto;
background-color: lightblue;
width: 100px;
height :100px;
padding: 25px;
top :0;
right :0;
bottom:0;
left:0;
}
</style>
</head>
<body>
<div> I am in the middle</div>
</body>
</html>

You can achieve this using CSS (your element display:inline-grid + grid-auto-flow: row; ) Grid and Flex Box ( parent element display:flex;),
See below snippet
#leftFrame {
display: flex;
height: 100vh;
width: 100%;
}
#tabs {
display: inline-grid;
grid-auto-flow: row;
grid-gap: 24px;
justify-items: center;
margin: auto;
}
html,body {
margin:0;
padding:0;
}
<div>
<div id=leftFrame>
<div id=tabs>
<div>first</div>
<div>second</div>
</div>
</div>
</div>

This should works
.center-div {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
text-align: center;
min-height: 100vh;
}
<div class="center-div">Center Div</div>

If you prefer it without flexbox, grid, table or vertical-align: middle;
You can do:
HTML
<div class="box">
<h2 class="box__label">square</h2>
</div>
CSS
.box {
box-sizing: border-box;
width: 100px;
height: 100px;
text-align: center;
border: 1px solid black;
}
.box__label {
box-sizing: border-box;
display: inline-block;
transform: translateY(50%);
text-align: center;
border: 1px solid black;
}

If it's only about text aligning it's simple. Just use this:
vertical-align: middle; /* vertical centering*/
text-align: center; /* horizontal centering*/
Parent styling is not needed.
In some cases when the parent has some style properties it may affect the child, where this will not work properly.

Approach 6
/*Change units to "%", "px" or whatever*/
#wrapper{
width: 50%;
height: 70vh;
background: rgba(0,0,0,.5);
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}
#left{
width: 50%;
height: 50vh;
position: absolute;
top: 0;
bottom: 0;
left: 0;
margin: auto;
background: red;
}
#right{
width: 50%;
height: 50vh;
position: absolute;
top: 0;
bottom: 0;
right: 0;
margin: auto;
background: green;
}
.txt{
text-align: center;
line-height: 50vh;
}
<div id="wrapper">
<div id="left" class="txt">Left</div>
<div id="right" class="txt">Right</div>
</div>
.container{
width: 50%; //Your container width here
height: 50%; //Your container height here
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}

The easiest way of centering a div both vertically and horizontally is as follows:
<div style="display: table; width: 200px; height: 200px; border: 1px solid black;">
<div style="display: table-cell; vertical-align: middle; text-align: center;">
Text Here
</div>
</div>
One More Example:
.parent {
display: table;
width: 100%;
height: 100%;
}
.child {
display: table-cell;
vertical-align: middle;
text-align: center;
}
<div class="parent">
<div class="child">
<h4><u>SERVICE IN BANGLADESH FLEET RESERVE <br> AND <br> RE-ENGAGEMENT ORDER FOR DEFENCE SERVICE</u></h4>
</div>
</div>

I see this the shortest and easiest way. However it depends on the element width and height. So feel free to adjust more the percentages on translate(50%, 50%);.
.divContainer {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
transform: translate(50%, 50%);
}
<div class="divContainer">I am centered</div>

The simplest flexbox approach:
The easiest way how to center a single element vertically and horizontally is to make it a flex item and set its margin to auto:
If you apply auto margins to a flex item, that item will automatically
extend its specified margin to occupy the extra space in the flex
container...
.flex-container {
height: 150px;
display: flex;
}
.flex-item {
margin: auto;
}
<div class="flex-container">
<div class="flex-item">
This should be centered!
</div>
</div>
This extension of margins in each direction will push the element exactly to the middle of its container.

In the case where I was trying to vertically align text content inside button::before and button::after, I was able to get it working using vertical-align: text-top.
button::after {
vertical-align: text-top;
}

I use this CSS code:
display: grid;
justify-content: center;
align-items: center;
The source is CSS-Tricks

This is a related problem that people might come to this page when searching: When I want to centre a div for a "waiting.." 100px square animated gif, I use:
.centreDiv {
position: absolute;
top: -moz-calc(50vh - 50px);
top: -webkit-calc(50vh - 50px);
top: calc(50vh - 50px);
left: -moz-calc(50vw - 50px);
left: -webkit-calc(50vw - 50px);
left: calc(50vw - 50px);
z-index: 1000; /* whatever is required */
}

Develop Reference

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Centered element with an `aspect-ratio` take up the maximum available space - css

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