.block-psrc-video {
	margin: 0 auto 40px;
	text-align: center;
	position: relative;
	padding-bottom: 56.25%; /* 16:9 */
	height: 0;
}

.block-psrc-video iframe {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}