html, body {
      margin: 0;
      overflow: hidden;
      background: black;
    }

    #viewport {
      width: 100vw;
      height: 100vh;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
    }

    .row {
      display: flex;
      width: 100%;
      flex-shrink: 0;
    }

    .separator {
      width: 100%;
      height: 1px;
      background-color: black;
      flex-shrink: 0;
    }

    .left, .right {
      height: 100%;
    }