.vimeo-video-wrap { 
	position: relative; overflow: hidden;
	width: 100%; height: 0;
	padding-bottom: 56.25%; /* 16:9 aspect ratio (9 / 16 = 0.5625) */
}
.vimeo-video-wrap.constrained{margin: 0 auto;}
.vimeo-video-wrap iframe {
	position: absolute;
	top: 0; left: 0;
	width: 100%; height: 100%;
}