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

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