<div class="video-container">
<iframe width="853" height="480" src="https://www.youtube.com/embed/FqZG6J1z3Iw" frameborder="0" allowfullscreen></iframe></div>

.video-container {
position: relative;
padding-bottom: 56.25%;
padding-top: 30px; height: 0; overflow: hidden;
}

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