.responsive-embed {
  position: relative;
  width: 100%;
}

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

.responsive-embed-16x9 {
  aspect-ratio: 16 / 9;
}

.responsive-embed-4x3 {
  aspect-ratio: 4 / 3;
}

.responsive-embed-5x6 {
  aspect-ratio: 5 / 6;
}