html, body, .banner {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    background-color: transparent;
    font-size: 1vw;
}

.banner {
    position: relative;
    color: #fff;
    overflow: hidden;
    cursor: pointer;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: none;
}

.banner, .banner *, .banner:after, .banner:before {
    box-sizing: border-box;
}

.video {
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: absolute;
    top: 0; right: 0; bottom: 0; left: 0;
}

.btn-sound, .btn-replay, .btn-play {
    position: absolute;
    box-sizing: border-box;
    border-radius: 50%;
    background-repeat: no-repeat;
    cursor: pointer;
    width: 2em;
    height: 2em;
    top: 2em;
    left: 2em;
    background-color: rgba(0, 0, 0, 0.3);
    background-image: url(btn-sound-on.svg);
    background-size: 40% auto;
    background-position: 50% 50%;
    transition: opacity .1s ease;
    opacity: 1
}

.btn-play {
    display: none;
    background-image: url(btn-play.svg);
    background-size: 34% auto;
    background-position: 58% 48%;
    width: 5em;
    height: 5em;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto
}

.btn-sound:hover, .btn-replay:hover, .btn-play:hover {
    opacity: 1
}

.btn-replay {
    display: none;
    background-image: url(btn-replay.svg);
    background-size: 40% auto;
    background-position: 50% 49%;
}

.btn-sound:after, .btn-replay:after {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
}

.btn-sound-on {
    background-color: #fff;
    background-image: url(btn-sound-off.svg);
}

@media (orientation: portrait) {
    html, body {
        font-size: 1vh
    }
    .banner {
        font-size: 1.6em
    }
    .btn-sound, .btn-replay {
        top: 1em;
        left: 1em
    }
}

@media (min-aspect-ratio: 16/9) {
  .video {
      height: 300%;
      top: -100%;
    }
}
@media (max-aspect-ratio: 16/9) {
  .video {
      width: 300%;
      left: -100%;
    }
}

@supports (object-fit: cover) {
  .video {
    top: 0; left: 0;
    width: 100%; height: 100%;
    object-fit: cover;
  }
}

@media (min-aspect-ratio: 16/9) {
  _:-ms-lang(x), _:-webkit-full-screen, .video {
      height: 300%;
      top: -100%;
    }
}
@media (max-aspect-ratio: 16/9) {
  _:-ms-lang(x), _:-webkit-full-screen, .video {
      width: 300%;
      left: -100%;
    }
}

.video::-webkit-media-controls-start-playback-button, .video::-webkit-media-controls {
    display: none !important;
    -webkit-appearance: none;
}