// iframe video
.video-responsive {
  margin: 0;
  padding-bottom: 56.25%;
  position: relative;

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

// html5 video
.video {
  width: 100%;
  height: auto;
}