.SceneTransition {
    position:absolute;
    left:0;
    top:0;
    right:0;
    bottom:0;
    background: #fff;
    opacity: 0;
    animation: scene-transition-fade-in 1.2s forwards;
  }
  .SceneTransition.fade-out {
    animation: scene-transition-fade-out 1.2s forwards;
  }
  
  @keyframes scene-transition-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  @keyframes scene-transition-fade-out {
    from { opacity: 1; }
    to { opacity: 0; }
  }