.yt-wrap {
	margin-bottom: 2.5em;
}
.yt-wrap.nonmargin {
	margin-bottom: 0;
}
.yt-wrap iframe {
	width: 100%;
	height: 320px;
}
@media only screen and (max-width:640px){
	.yt-wrap iframe {
		height: 68vh;
	}
}