.video-wrapper {
    position: relative;
    padding-bottom: 74.25%; /* 4:3 ratio */
    padding-top: 30px; /* IE6 workaround*/
    height: 0;
    overflow: hidden;
}

iframe,object,embed,video {
    position: absolute !important;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}