.responsive-video,
.media-youtube-video,
.media-vimeo-preview-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  padding-top: 25px;
  height: 0;
}

.responsive-video__embed,
.responsive-video iframe,
.media-youtube-video iframe,
.media-vimeo-preview-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.responsive-video--4-3 {
  padding-bottom: 75%;
}