.video-responsive {
    position: relative;
    padding-bottom: 56.25%; /* 16/9 ratio */
    padding-top: 30px; /* IE6 workaround*/
    height: 0;
    overflow: hidden;
}

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