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Answer for adobe ask the experts

Q: What is your favorite Css 'trick'?

Responsive images in CSS are pretty easy: just set the width: 100% and height: auto and you're good to go. Things get a little unpredictable, though, when dealing with background images. Since putting a height on the element causes lots of responsive headaches, one workaround is to have the container scale by its aspect ratio. This can be achieved by setting a few attributes to the element's :after tag:

.my-element {
  overflow: hidden;
  position: relative;
.my-element:after {
  content: "";
  display: block;
  height: 0;
  padding-top: 56.25%; /* Aspect ratio = height divided width times 100 */

See a CSS demo, or grab this handy Sass mixin.

Daniel Box
Designer, KNI


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commented Oct 30, 2015

Good little trick ;)

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