Keep video aspect ratio while scaling

video-ratio.css

.videoWrapper {
	position: relative;
	padding-bottom: 56.25%; /* 16:9 */
	padding-top: 0px; /* You can add the interface buttons' room here if any */
	height: 0;
}

.videoWrapper iframe {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}