.video {
  aspect-ratio: 16 / 9;
  width: 100%;
}

@supports not (aspect-ratio: 1) {
  .video-container {
    position: relative;
    padding-bottom: 56.25%;
  }

  .video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }

}