.mvVideo{
  padding-top: 56.25%;
  position: relative;
  margin-bottom: -60px;
}
.mvVideo #youtube{
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 100%;
}

.mvVideo #mute {
  position: absolute;
  bottom: 10%;
  left: 4%;
  z-index: 110; }
  .mvVideo #mute:before {
    content: "";
    display: block;
    width: 50px;
    height: 50px;
    background-image: url(../img/sound_off.svg);
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain; }
    .mvVideo #mute.on:before {
      background-image: url(../img/sound_on.svg); }
      @media screen and (max-width: 768px) {
        .mvVideo{
          margin-top: 50px;
        }
        .mvVideo #mute {
          bottom: 28%; }
          .mvVideo #mute:before {
            width: 30px;
            height: 30px; } }