body {
    margin: 0;
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #f9f9f9;
  }
  canvas {
    border: 2px solid #333;
    background: #f1d28d;
    margin-top: 20px;
  }
  button {
    margin-top: 10px;
    padding: 8px 16px;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 4px;
  }