html, body {
    height: 100%;
  }
    
  body {
    overflow: hidden;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
  }
    
  #mainCanvas {
    position: absolute; 
    z-index: 0; 
    margin: auto; 
    top: 0; 
    left: 0; 
    background-color: transparent;
  }