.movie-wrap {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /*アスペクト比 16:9の縦幅*/
  overflow: hidden;
}
.movie-wrap img {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: auto;
  transform: translateY(-50%);
}
.movie-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}