.flex-video {
 position: relative;
 padding-top: 25px;
 padding-bottom: 67.5%;
 height: 0;
 margin-bottom: 16px;
 overflow: hidden;
 }

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