.video-embed-container { position:relative; }
.video-embed-container > .video-embed-16-9 { height:0; padding-bottom:56.25%; position:relative; }
.video-embed-container > .video-embed-4-3 { height:0; padding-bottom:75%; position:relative; }
.video-embed-container iframe { position:absolute; top:0; left:0; width:100%; height:100%; }