I wish to achieve the following effect, regardless browser (re)size:
The images are set to be flexible, so, each of them as a max-width declared as:
100%.
http://jsfiddle.net/rgdrqbg4/
The css:
img {
max-width: 100% !important;
vertical-align: middle;
}
.home-video {
position: relative;
width: 57.291666666667%;
}
.video-placeholder {
position: relative;
left: 0;
top:0;
}
.play-video {
position: absolute;
left: 32.545454545455%;
top: 22.508038585209%;
}
Can someone please point some directions, or name some common used techniques to overlay two images while keep them absolute centered, regardless the viewport width?
A common technique is to set top and left to 50% and set margin-top and margin-left negative half of the height and width of your image.
Try this:
.play-video {
position: absolute;
top: 50%;
left: 50%;
margin-top: -90px;
margin-left: -97px;
}
Working JSFiddle sample: http://jsfiddle.net/rgdrqbg4/1/
UPDATE
You can also set top, left, right, and bottom to 0 and set margin to auto for it to auto calculate the margin needed to center the image.
.play-video {
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
margin: auto;
}
Working JSFiddle sample: http://jsfiddle.net/rgdrqbg4/5/
This will only work if the image inside is smaller than the image that is wrapping it.
UPDATE
You are setting width for .home-video. At some point in the viewport, the container has more width than the image so the black box is centering accoring to the container, not to the parent image. To make the .home-video container have the same width as its larger image you can use this:
I added a width of 30% to the black box so it can shrink with the larger image too.
.home-video{
display: inline-block;
}
.play-video {
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
width: 30%;
margin: auto;
}
And remove the width you set before.
Working JSFiddle sample: Working JSFiddle sample: http://jsfiddle.net/rgdrqbg4/9/
img {
max-width: 100% !important;
vertical-align: middle;
}
.home-video {
position: relative;
width: 57.291666666667%;
}
.video-placeholder {
position: relative;
left: 0;
top:0;
}
.play-video {
position: absolute;
left: 32.545454545455%;
top: 25.508038585209%;
width: 34%;
height: 40%;
}
<div class="home-video">
<img class="video-placeholder" src="http://lorempixel.com/570/320/" alt="video"/>
<img class="play-video" src="http://lorempixel.com/194/180/cat/" alt="play this video"/>
</div>
Do you mean like this? You were on the right track.
.play-video {
position: absolute;
top:20%;
height:inherit;
left:28%;
width:40%;
margin:0 auto;
}
http://jsfiddle.net/rgdrqbg4/7/
I'm trying to stretch content div to 100% height:
http://new.art-frame.spb.ru/catalog
content DIV:
<div id="rt-transition">...</div>
footer:
<footer id="rt-footer-surround">...</footer>
The problem is, I can't change html layout, only CSS.
(the best way is to use Firebug/Chrome inspector to see what's all about)
html {
position: relative;
min-height: 100%;
height: auto;
margin: 0;
}
body {
margin: 0 0 100px;
min-width: 100px !important;
}
footer {
position: absolute;
left: 0;
bottom: 0;
height: 100px;
width: 100%;
}
Try changing the height of the html to 100% instead of auto. Then, play around with the CSS of all the elements inside to make it fit. If there is excess overflow, use
body { overflow: hidden; }
To solve the problem, although this won't allow for scrolling.
Set:
min-height: 720px;
on your rt-main
I have a fixed div setup using this:
.box {
position: fixed;
width: 600px;
bottom: 20px;
left: 50%;
max-height: 400;
overflow:auto;
}
The problem I have is that on internet explorer it ignores the max-height, the div just expands upwards and out of view with no scroll bars, even if I set overflow: scroll;.
BTW I am using the hack to do fixed absolute position boxes so they stay on the screen reguardless of scrolling, if that matters:
* { margin: 0; }
* html .box { position: absolute; }
try this:
* html .box{
height: expression( this.scrollHeight > 399 ? "400px" : "auto" ); /* fix for ie 5+ */
}
.box {
max-height: 400px;
position: fixed;
width: 600px;
bottom: 20px;
left: 50%;
overflow:auto;
}
I am trying to make height auto. Whatever i tried did not work until now.
I am using masterpage, asp.net 4.0 ,css
Here the config
Here the css classes
*
{
margin: 0;
padding: 0;
}
.logo
{
height: 100px;
width: 1000px;
position: absolute;
top: 0px;
}
body, html
{
height: auto;
height: 100%;
}
.footer
{
visibility: hidden;
}
.MenuBarMasterPage
{
position: absolute;
top: 202px;
margin-left: auto;
margin-right: auto;
width: 1000px;
height: 40px;
}
body
{
background: #0C0C0C url(http://static.monstermmorpg.com/images/backgrounds/animus-mix.gif) repeat;
margin-right: auto;
margin-left: auto;
width: 1000px;
background-position: top center;
}
.main
{
position: absolute;
top: 242px;
width: 1000px;
background: #D1D1D1 url(http://static.monstermmorpg.com/images/backgrounds/content.png) repeat;
z-index: 2;
height: auto;
}
According to the firebug the computed style height of main is 0px this is the problem
To avoid having to manually set a different fixed height on each page (which is a terrible solution), you have two options:
Use JavaScript to calculate the height.
Don't use absolute positioning.
There is no reason to use absolute positioning for your layout. You should remove position: absolute from almost everything, and write new CSS.
You're going to need a lot of float: left and float: right.
If you're using Bootstrap 4 (Flex)
If your <img> is direct children of a div with display:flex, you might want to set display:block on parent div instead, so height:auto will work.
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.