Iframe that Responsive

<div>
    <iframe src="http://www.youtube.com/embed/4aQwT3n2c1Q" height="315" width="560" allowfullscreen="" frameborder="0">
    </iframe>
</div>

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


.video-container {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 35px;
    height: 0;
    overflow: hidden;
}