.embed-responsive {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  overflow: hidden;
}

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

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