#bg {
  position: fixed;
  background-color: black;

  height: 100%;
  width: 100%;
  margin: 0;
  padding:0;

  z-index: 10000;

  animation: fadeout 2s;

  animation-fill-mode: forwards;

  pointer-events: none;
}

@keyframes fadeout {
  0% {
    background-color: #000000;
  }
  60% {
    background-color: #000000;
  }
  100% {
    background-color: #00000000;
  }
}