#video-extension {
  height: 450px;
  overflow: hidden;
  position: relative;
  background: transparent;
}

#video-extension:before {
  content: "";
  background: rgba(13, 20, 41, 0.3);
  position: absolute;
  bottom: 0;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1;
}