#opening-video {
  position: fixed;
  min-width: 100%;
  min-height: 100%;
  z-index: -1;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: auto;
  height: 100vh;
  -o-object-fit: cover;
     object-fit: cover;
}

.opening-motion__bg {
  position: fixed;
  background: white;
  opacity: 1;
  height: 100vh;
  width: 100%;
  z-index: 10000;
}

.to-transparent {
  opacity: 0.1;
  transition: 2s;
}

.to-none {
  display: none;
}