.movie {
  height: 0;
  margin: 3vw auto 0 auto;
  overflow: hidden;
  padding-bottom: 56.25%;
  position: relative;
  aspect-ratio: 9/16;
}
@media only screen and (max-width: 640px) {
    .movie {
        height: unset;
        aspect-ratio: 9/16;
    }
}

.movie iframe {
  border: #000 solid 1px;
  box-sizing: border-box;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}