I want my div to adapt its height to always equal its width. The width is percental. When the parent's width decreases, the box should decrease by keeping its aspect ratio.
How to do this is CSS?
This question is related to
css
layout
responsive-design
aspect-ratio
This is what I came up with. Here is a fiddle.
First, I need three wrapper elements for both a square shape and centered text.
<div><div><div>Lorem ipsum dolor sit amet, consectetuer adipiscing elit,
sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat
volutpat.</div></div></div>
This is the stylecheet. It makes use of two techniques, one for square shapes and one for centered text.
body > div {
position:relative;
height:0;
width:50%; padding-bottom:50%;
}
body > div > div {
position:absolute; top:0;
height:100%; width:100%;
display:table;
border:1px solid #000;
margin:1em;
}
body > div > div > div{
display:table-cell;
vertical-align:middle; text-align:center;
padding:1em;
}
Works on almost all browsers.
You can try giving padding-bottom
as a percentage.
<div style="height:0;width:20%;padding-bottom:20%;background-color:red">
<div>
Content goes here
</div>
</div>
The outer div is making a square and inner div contains the content. This solution worked for me many times.
Here's a jsfiddle
It is as easy as specifying a padding bottom the same size as the width in percent. So if you have a width of 50%, just use this example below
id or class{
width: 50%;
padding-bottom: 50%;
}
Here is a jsfiddle http://jsfiddle.net/kJL3u/2/
Edited version with responsive text: http://jsfiddle.net/kJL3u/394
Another way is to use a transparent 1x1.png with width: 100%
, height: auto
in a div
and absolutely positioned content within it:
html:
<div>
<img src="1x1px.png">
<h1>FOO</h1>
</div>
css:
div {
position: relative;
width: 50%;
}
img {
width: 100%;
height: auto;
}
h1 {
position: absolute;
top: 10px;
left: 10px;
}
HTML
<div class='square-box'>
<div class='square-content'>
<h3>test</h3>
</div>
</div>
CSS
.square-box{
position: relative;
width: 50%;
overflow: hidden;
background: #4679BD;
}
.square-box:before{
content: "";
display: block;
padding-top: 100%;
}
.square-content{
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
color: white;
text-align: center;
}
Source: Stackoverflow.com