#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: black;
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  #matrix {
    width: 100vw;
    height: 100vh;
    display: block;
  }