.video-container {
    position: relative;
    padding-top:70.57%;
    height: 0; 
    overflow: hidden;
}
 
.video-container iframe,
.video-container object,
.video-container embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
/* - See more at: http://avexdesigns.com/responsive-youtube-embed/#sthash.629NuApG.dpuf */