body {
  background: #111;
}

.video {
  height: 0;
  padding-bottom: 42.6%;
  position: relative;
}
.video__frame {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: auto;
  height: auto;
}
.video iframe {
  width: 100%;
  height: 100%;
  box-shadow: 0 0 40px #000;
}

.container {
  position: relative;
  width: 90%;
  margin: 10vh auto;
}