.embedded-video-container {
    position: relative;
    padding-bottom: 40%; /* 16/9 ratio */
    padding-top: 30px; /* IE6 workaround*/
    height: 0;
    overflow: hidden;
}

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