body {
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #000;
    color: white;
  }
  
  canvas {
    display: none;
    border: 1px solid #fff;
  }
  
  button {
    padding: 10px 20px;
    font-size: 20px;
  }