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<style>
	.video {
		position: relative;
		padding-bottom: 56.25%;
		height: 0;
		overflow: hidden;
	}
	.video iframe,
	.video object,
	.video embed {
		position: absolute;
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
	}
</style>

<div class="video">
	<iframe width="640" height="390" src="http://www.youtube.com/embed/oHg5SJYRHA0" frameborder="0" allowfullscreen=""></iframe>
</div>