Video Embed with Intrinsic Ratio

Display video iframes (particularly YouTube embeds) with an intrinsic ratio. Responsive CSS for video embeds.

CSS

.videoWrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;

  iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    }
}