.rwd-video {
  height: 0;
  overflow: hidden;
  padding-bottom: 100%;
  padding-top: 30px;
  position: relative;
}
.rwd-video iframe,
.rwd-video object,
.rwd-video embed {
  height: 100%;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}