Responsive 16:9 Video Wrapper

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  max-width: 100%;
  background: #000;
}

.video-wrapper iframe,
.video-wrapper object,
.video-wrapper embed,
.video-wrapper video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}