Tuesday, February 17, 2015

Constant aspect ratio element


You can create containers that maintain a constant aspect ratio by using padding-bottom as a percentage. The CSS spec says that padding-bottom is defined relative to the *width*, not height, so if you want a 5:1 aspect ratio container you can do something like this:


<div style="width: 100%; position: relative; padding-bottom: 20%;">
<div style="position: absolute; left: 0; top: 0; right: 0; bottom: 0;">
this content will have a constant aspect ratio that varies based on the width.
</div>
</div>


This is useful for responsive layouts where you want the width to adjust dynamically but want to keep, say, square photo thumbnails.

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