.main {
  position: relative;

  video {
    position: absolute;
    top: 20%;
    right: 0;
    left: 0;

    width: 100vw;
    height: 390px;
  }

  @media screen and (min-width: 1024px) {
    video {
      position: inherit;

      width: 100vw;
      height: 100vh;
    }
  }

  [class~="buttons"] {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;

    opacity: 0.5;
  }
}