<style>
.embed-container {
  --video--width: 1296;
  --video--height: 540;

  position: relative;
  padding-bottom: calc(var(--video--height) / var(--video--width) * 100%); /* 41.66666667% */
  overflow: hidden;
  max-width: 100%;
  background: black;
}

.embed-container iframe,
.embed-container object,
.embed-container embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
</style>
<div class='embed-container'>
  <iframe src='https://player.vimeo.com/video/208791851?autoplay=1&loop=1&background=1' frameborder='0' webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe>
</div>

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