.yt-container {
  position:relative;
  padding-bottom:56.25%;
  padding-top:30px;
  height:0;
  overflow:hidden;
}

.yt-container iframe{
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  border:none;
  allow: "accelerometer; encrypted-media; gyroscope; picture-in-picture";
}