Assume the parent is relative, the child (style-x) is absolute. I used top 50%, left 25% to center the child.
I wish to actually center the child, so I set transform: translate(-50%, -50%). I am unsure if this is centered, so I double check by deleting that line and adding 'margin-top: -55px;' (half of the height), and 'margin-left: -45px;' (half of the width).
These two lines position my element in slightly different locations, yet this is different from my model of CSS. What's going on?
body {
height: 100%;
width: 100%;
margin: 0 auto;
}
#main {
overflow: auto;
height: 64vh;
width: 38vw;
margin: 0 auto;
margin-top: 10%;
position: relative;
border: 1vh solid black;
overflow: hidden;
}
#style-x {
/*Why doesn't translate(-50%, -50%) give me
the same position as setting the margin top and
left to half of the width and height?*/
width: 90px;
height: 110px;
/*
transform: translate(-50%, -50%);*/
margin-top: -55px;
margin-left: -45px;
position: absolute;
top: 50%;
left: 25%;
padding: 2%;
text-align: center;
background: green;
}
#left-col {
float: left;
width: 4%;
height: 101%;
margin-left: 46%;
background: black;
}
#right-col {
float: left;
width: 4%;
height: 101%;
margin: 0 auto;
margin-left: 0;
background: black;
}
<body>
<section id='main'>
<div id='style-x'>X</div>
<div id='left-col'></div>
<div id='right-col'></div>
</section>
</body>
Here's my Codepen if you'd like a visualization.
http://codepen.io/sentedelviento/pen/ORyqzv
There is no problem in your method. Both will try to center based on the values you provide.
The margin method fails cos you aren't using a Box Sizing method like so.
box-sizing: border-box
This results in all your elements to be larger than the height and width specified. Without this, you are telling the browser to add any padding or border to both width & height.
And so your larger element shifts when using using the margin method.
You've set a 2% padding on style-x, and a width of 38vw on #main. When using margins to center things, you would need to account for these varying values.
When you set a percentage padding, its calculated based on the width of the containing block.
The transform method on the other hand, uses the bounding box of the containing block and has no problem centering a larger element.
I'd suggest you include this box-sizing on main and style-x if using the margin method. You could just use
*, after, before {
box-sizing: border-box;
}
This gives better control over dimensions across all elements.
I'm not finding any information on this. Might be because my approach is incorrect.
I'm having my image positioned absolutely under a div which uses full window width.
I'm using margin-left: 30%, so that images are always positioned 30% from the left border.
Everything else is set for responsive image handling..
I got the code correct that it scales like I want if the browser-window gets resized.
But because the image is not centered, the scaling happens "too late", so the right part will be hidden outside view.
Can I solve this with the scaling starting "earlier"?
Or using sth different than margin-left: 30% or left: 30% ?
see here: JsFiddle - Image out of view when resizing window
img.aaa
{
position: absolute;
max-width: 85%;
max-height: 85%;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin-top: auto;
margin-right: auto;
margin-bottom: auto;
margin-left: 30%;
}
You can use margin-left: auto which will center the image. If it has to be a certain distance from the left, use a container div and the following css. This will prevent the image from going outside the body and getting cut off.
.container {
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
padding-left: 30%;
//text-align: center; //remove padding and uncomment this to center image in div
}
img.aaa {
max-width: 100%;
max-height: 85%;
box-shadow: 0 5px 10px rgba(0,0,0,0.8);
}
DEMO
I have a div with position:absolute and I need to get it in the centre of the document. What I thought would work is using left:50%; top:50%, but this moves the div 50% from the top and left according to its sides, so it's more to the right and bottom than I'd want. Is there a way to move the div using the centre of it as the focus point?
The height and width both have to be 300px and the div must always be in the centre of the document regardless of the resolution - which is why I can't use static values and have to use percentages
I didn't understood what you meant by but this moves the document 50% from the top and left so you should target the div and not the container element.
Demo
div {
height: 100px;
width: 100px;
background: tomato;
position: absolute;
top: 50%;
left: 50%;
margin-left: -50px;
margin-top: -50px;
}
Above am using all the properties which you are using, but apart from that am using margin-left and margin-top with negative values which are equivalent to 1/2 of the elements height and width
Now that's the solution for a fixed width element, if your element width and height are variable, you will have to set your container element to display: table-cell; and than use vertical-align: middle; to align the element to vertically center, whereas margin: auto; will take care of the horizontally center alignment.
Demo
Note: Am using display: table; for body which is kinda dirty way, so consider using a wrapper element for that and then assign display: table-cell; to that, also, make sure you have see all the parent element height to 100%
why not try this, its simpler and more general than messing with pixels:
.div {
position:absolute;
border:1px solid black;
width:100px;
height:100px;
margin: auto;
top: 0; left: 0; bottom: 0; right: 0;
}
Based on Mr.Alien's fiddle, i would suggest you to use calc for exact middle alignment for fixed dimension width
The idea is to use calc(50% - 150px); i.e., (50% - half the dimension of the block)
This way, you can avoid the hacks of :
margin-left: -xxpx;
margin-top: -xxpx;
CSS
div {
height: 300px;
width: 300px;
background: tomato;
position: absolute;
top: calc(50% - 150px);
top: -moz-calc(50% - 150px);
top: -webkit-calc(50% - 150px);
left: calc(50% - 150px);
left: -moz-calc(50% - 150px);
left: -webkit-calc(50% - 150px);
}
working fiddle
user2211216 got what I wanted - just use
margin: auto;
top: 0; left: 0; bottom: 0; right: 0;
position: absolute;
I have a piece of CSS code that arranges the bottom div at bottom 0 and position fixed. This works perfectly but when I am resizing the window the bottom div is hiding the above ones (middle and top).
Here is the code:
.topFull{
width:100%;
height: 90px;
background:#1b3f61;
position: fixed;
top: 0px;
left: 0px;
}
.middle{
width:100%;
min-width:850px;
max-width:1000px;
height: auto;
margin-top: 120px;
position: absolute;
margin-left: -50px;
}
.bottomFull{
width: 100%;
background:#1b3f61;
height: 180px;
position: fixed;
left: 0;
bottom: 0;
}
Your .bottomFull tag is fixed and 180px height. So if you have a smaller screen, it will always been positioned over the other content.
You could do something like:
#media only screen and (max-width:500px){
.bottomFull{height:80px;}
}
I think I solved it. Instead of messing around with bottomFull properties I change middle div a little bit and add
padding-bottom: 120px
now even my bottomFull div is always at bottom of window I can scroll and view middle div's contents.
I would like to make a position: fixed; popup box centered to the screen with a dynamic width and height. I used margin: 5% auto; for this. Without position: fixed; it centers fine horizontally, but not vertically. After adding position: fixed;, it's even not centering horizontally.
Here's the complete set:
.jqbox_innerhtml {
position: fixed;
width: 500px;
height: 200px;
margin: 5% auto;
padding: 10px;
border: 5px solid #ccc;
background-color: #fff;
}
<div class="jqbox_innerhtml">
This should be inside a horizontally
and vertically centered box.
</div>
How do I center this box in screen with CSS?
If your div has a known width and height, then you basically need to set top and left to 50% to center the left-top corner of the div. You also need to set the margin-top and margin-left to the negative half of the div's height and width to shift the center towards the middle of the div.
position: fixed;
width: 500px;
height: 200px;
top: 50%;
left: 50%;
margin-top: -100px; /* Negative half of height. */
margin-left: -250px; /* Negative half of width. */
Or, if your div has a dynamic/undefined width and/or height, then instead of the margin, set the transform to the negative half of the div's relative width and height.
position: fixed;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
Or, if your div has at least a fixed width and you don't care about centering vertically and old browsers such as IE6/7, then you can instead also add left: 0 and right: 0 to the element having a margin-left and margin-right of auto, so that the fixed positioned element having a fixed width knows where its left and right offsets start. In your case thus:
position: fixed;
width: 500px;
margin: 5% auto; /* Will not center vertically and won't work in IE6/7. */
left: 0;
right: 0;
Again, this works only in IE8+ if you care about IE, and this centers only horizontally not vertically.
I want to make a popup box centered to the screen with dynamic width and height.
Here is a modern approach for horizontally centering an element with a dynamic width - it works in all modern browsers; support can be seen here.
Updated Example
.jqbox_innerhtml {
position: fixed;
left: 50%;
transform: translateX(-50%);
}
For both vertical and horizontal centering you could use the following:
Updated Example
.jqbox_innerhtml {
position: fixed;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
You may wish to add in more vendor prefixed properties too (see the examples).
Or just add left: 0 and right: 0 to your original CSS, which makes it behave similarly to a regular non-fixed element and the usual auto-margin technique works:
.jqbox_innerhtml
{
position: fixed;
width:500px;
height:200px;
background-color:#FFF;
padding:10px;
border:5px solid #CCC;
z-index:200;
margin: 5% auto;
left: 0;
right: 0;
}
Note you need to use a valid (X)HTML DOCTYPE for it to behave correctly in IE (which you should of course have anyway..!)
Add a container like:
div {
position: fixed;
bottom: 0;
left: 0;
width: 100%;
text-align: center;
}
Then put your box into this div will do the work.
Edit: as mentioned in the comments, the inner content needs to be set to display: inline-block assuming there're two divs like:
<div class="outer">
<div class="inner">
content goes here
</div>
</div>
Then the CSS for the inner needs to be:
.outer {
position: fixed;
text-align: center;
left: 0;
right: 0;
}
.inner {
display: inline-block;
}
Together with the outer div having a left: 0; right:0; and text-align: center this will align the inner div centered, without explicitly specifying the width of the inner div.
Just add:
left: calc(-50vw + 50%);
right: calc(-50vw + 50%);
margin-left: auto;
margin-right: auto;
Center fixed position element
(the simple & best way I know)
position:fixed;
top: 0; left: 0;
transform: translate(calc(50vw - 50%));
For centering it horizontally & vertically (if height is same as width)
position:fixed;
top: 0; left: 0;
transform: translate(calc(50vw - 50%), calc(50vh - 50%));
Both of these approaches will not limit centered element's width less than viewport width, when using margins in flexbox, inside centered element
#modal {
display: flex;
justify-content: space-around;
align-items: center;
position: fixed;
left: 0;
top: 0;
width: 100%;
height: 100%;
}
inside it can be any element with diffenet width, height or without.
all are centered.
This solution does not require of you to define a width and height to your popup div.
http://jsfiddle.net/4Ly4B/33/
And instead of calculating the size of the popup, and minus half to the top, javascript is resizeing the popupContainer to fill out the whole screen...
(100% height, does not work when useing display:table-cell; (wich is required to center something vertically))...
Anyway it works :)
left: 0;
right: 0;
Was not working under IE7.
Changed to
left:auto;
right:auto;
Started working but in the rest browsers it stop working!
So used this way for IE7 below
if ($.browser.msie && parseInt($.browser.version, 10) <= 7) {
strAlertWrapper.css({position:'fixed', bottom:'0', height:'auto', left:'auto', right:'auto'});
}
I used vw (viewport width) and vh (viewport height). viewport is your entire screen. 100vw is your screens total width and 100vh is total height.
.class_name{
width: 50vw;
height: 50vh;
border: 1px solid red;
position: fixed;
left: 25vw;top: 25vh;
}
You can basically wrap it into another div and set its position to fixed.
.bg {
position: fixed;
width: 100%;
}
.jqbox_innerhtml {
width: 500px;
height: 200px;
margin: 5% auto;
padding: 10px;
border: 5px solid #ccc;
background-color: #fff;
}
<div class="bg">
<div class="jqbox_innerhtml">
This should be inside a horizontally and vertically centered box.
</div>
</div>
I just use something like this:
.c-dialogbox {
--width: 56rem;
--height: 32rem;
position: fixed;
width: var(--width);
height: var(--height);
left: calc( ( 100% - var(--width) ) / 2 );
right: calc( ( 100% - var(--width) ) / 2 );
top: calc( ( 100% - var(--height) ) / 2 );
bottom: calc( ( 100% - var(--height) ) / 2 );
}
It centers the dialog box both horizontally and vertically for me, and I can use different width and height to fit different screen resolutions to make it responsive, with media queries.
Not an option if you still need to provide support for browsers where CSS custom properties or calc() are not supported (check on caniuse.)
This one worked the best for me:
display: flex;
justify-content: center;
align-items: center;
position: fixed;
left: 0;
top: 0;
width: 100%;
height: 100%;
To fix the position use this :
div {
position: fixed;
left: 68%;
transform: translateX(-8%);
}
simple, try this
position: fixed;
width: 500px;
height: 300px;
top: calc(50% - 150px);
left: calc(50% - 250px);
background-color: red;
One possible answer:
<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>CSS Center Background Demo</title>
<style type="text/css">
body {
margin: 0;
padding: 0;
}
div.centred_background_stage_1 {
position: fixed;
z-index:(-1 );
top: 45%;
left: 50%;
}
div.centred_background_stage_2 {
position: relative;
left: -50%;
top: -208px;
/* % does not work.
According to the
http://reeddesign.co.uk/test/points-pixels.html
6pt is about 8px
In the case of this demo the background
text consists of three lines with
font size 80pt.
3 lines (with space between the lines)
times 80pt is about
~3*(1.3)*80pt*(8px/6pt)~ 416px
50% from the 416px = 208px
*/
text-align: left;
vertical-align: top;
}
#bells_and_wistles_for_the_demo {
font-family: monospace;
font-size: 80pt;
font-weight: bold;
color: #E0E0E0;
}
div.centred_background_foreground {
z-index: 1;
position: relative;
}
</style>
</head>
<body>
<div class="centred_background_stage_1">
<div class="centred_background_stage_2">
<div id="bells_and_wistles_for_the_demo">
World<br/>
Wide<br/>
Web
</div>
</div>
</div>
<div class="centred_background_foreground">
This is a demo for <br/>
<a href="http://stackoverflow.com/questions/2005954/center-element-with-positionfixed">
http://stackoverflow.com/questions/2005954/center-element-with-positionfixed
</a>
<br/><br/>
<a href="http://www.starwreck.com/" style="border: 0px;">
<img src="./star_wreck_in_the_perkinnintg.jpg"
style="opacity:0.1;"/>
</a>
<br/>
</div>
</body>
</html>
Try using this for horizontal elements that won't center correctly.
width: calc (width: 100% - width whatever else is off centering it)
For example if your side navigation bar is 200px:
width: calc(100% - 200px);
This works wonderfully when you don't know the size of the thing you are centering, and you want it centered in all screen sizes:
.modal {
position: fixed;
width: 90%;
height: 90%;
top: 5%; /* (100 - height) / 2 */
left: 5%; /* (100 - width) / 2 */
}
What I use is simple. For example I have a nav bar that is position : fixed so I adjust it to leave a small space to the edges like this.
nav {
right: 1%;
width: 98%;
position: fixed;
margin: auto;
padding: 0;
}
The idea is to take the remainder percentage of the width "in this case 2%" and use the half of it.
Had this problem so I concluded that using a (invisible) container is the best option (based on answer #Romulus Urakagi Ts'ai). To make it with flexbox:
.zoom-alert {
position: fixed;
justify-content: center;
display: flex;
bottom: 24px;
right: 0;
left: 0;
z-index: 100000;
width: 100%;
&__alert {
flex: 0 0 500px;
padding: 24px;
background-color: rgba(212, 193, 105, 0.9);
border: 1px solid rgb(80, 87, 23);
border-radius: 10px;
}
}
(the syntax is SCSS but can be easily modified to pure CSS)
Center element of a div with the property of
position:fixed
Html and Css code
.jqbox_innerhtml {
position: fixed;
width:100%;
height:100%;
display: flex;
justify-content: space-around;
align-items: center;
left: 0;
top: 0;
width: 100%;
height: 100%;
border: 5px solid #ccc;
background-color: #fff;
}
<div class="jqbox_innerhtml">
This should be inside a horizontally
and vertically centered box.
</div>
Another simple solution is to set the width of the element to fit-content and set the left and right to 0px;
width: fit-content;
position: fixed;
left: 0px;
right: 0px;
This is useful if you don't know the width of the element.
The only foolproof solution is to use table align=center as in:
<table align=center><tr><td>
<div>
...
</div>
</td></tr></table>
I cannot believe people all over the world wasting these copious amount to silly time to solve such a fundamental problem as centering a div. css solution does not work for all browsers, jquery solution is a software computational solution and is not an option for other reasons.
I have wasted too much time repeatedly to avoid using table, but experience tell me to stop fighting it. Use table for centering div. Works all the time in all browsers! Never worry any more.