Vimeo - Full-width background wrapper

gistfile1.txt

<div class="iframe-wrapper">
  <iframe src="https://player.vimeo.com/video/123456789?autoplay=1&loop=1&byline=0&title=0">
</div>

/* Makes a fixed background wrapper
which the user cannot interact with */

.iframe-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

/* Make the iframe keep an aspect ratio, and
position it in the middle of its parent wrapper*/

.iframe-wrapper iframe {
  width: 100vw;
  height: 56.25vw; /* Given a 16:9 aspect ratio, 9/16*100 = 56.25 */
  min-height: 100vh;
  min-width: 177.77vh; /* Given a 16:9 aspect ratio, 16/9*100 = 177.77 */
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}