: 'Oxygen', sans-serif;
      width: : 100%;
      height: 100%;
      margin: 0;
      background: #f6f6f6;
    }

    #slider {
      background-color: #eee;
    }

    ._3d #slider {
      background-color: rgba(255, 255, 255, 0);
    }

    section {
      font-size: 16px;
      margin: 50px 15%;
    }

    section::after {
      content: " ";
      background-color: rgba(200, 200, 200, 0.5);
      width: 100%;
      height: 100%;
    }

    #stage_root {
      width: 100%;
      height: 100%;
      tra