The embed code:
<div class="videoWrapper"> <iframe width="560" height="315" src="https://www.youtube.com/embed/7gd-EHb2nnc?showinfo=0" frameborder="0" allowfullscreen></iframe> </div>
The CSS:
.videoWrapper {
position: relative;
padding-bottom: 56.25%; /* 16:9 */
padding-top: 25px;
height: 0;
}
.videoWrapper iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}