.elm.video {
  line-height: 0;
  background-color: #DCDCDC;
}

.elm.video div.video_wrapper {
  width: 100%;
  position: relative;
  padding-top: 56.25%;
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}

.elm.video.aspect_ratio_4_3 div.video_wrapper {
   padding-top: 75%;
}

.elm.video.aspect_ratio_1_1 div.video_wrapper {
   padding-top: 100%;
}

.elm.video.aspect_ratio_12_5 div.video_wrapper {
   padding-top: 41.67%;
}

.elm.video.aspect_ratio_9_16 div.video_wrapper {
   padding-top: 177.78%;
}

.elm.video iframe {
  position:  absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 100%;
  border: 0;
}