body {
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 20px;
      background: #f2f2f2;
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    canvas {
      border: 2px solid #333;
      max-width: 100%;
      height: auto;
    }
    #info, #buttons {
      margin: 10px;
    }
    button {
      margin: 5px;
      padding: 6px 12px;
    }