.responsive-video-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.responsive-video-wrapper::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

@media (max-width: 768px) {
  .responsive-video-wrapper::before {
    padding-top: 100%;
  }
}

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