play-icon in css

play-icon.css

.youtube-thumb {
	height: 100px;
	line-height: 100px;
	background: #fff;
	position: relative;
}

.youtube-thumb:before {
	content: " ";
	display: block;
	position: absolute;
	background: #000;
	width: 40px;
	height: 40px;
	opacity: .4;
	top: 30px;
	left: 30px;
	border-radius: 20px;
}

.youtube-thumb:after {
	content: " ";
	display: block;
	position: absolute;
	width: 0px;
	height: 0px;
	top: 40px;
	left: 44px;
	border-bottom: 10px solid transparent;
	border-top: 10px solid transparent;
	border-left: 16px solid #fff;
}

.youtube-thumb img {
	display: inline;
	vertical-align: middle;
}