body {
      margin: 0;
      background: blanchedalmond;
      color: rgb(195, 18, 18);
      font-family: sans-serif;
      text-align: center;
    }
    canvas {
      background: #111;
      display: block;
      margin: 0 auto;
    }
    .controls {
      display: flex;
      justify-content: center;
      gap: 20px;
      margin-top: 20px;
    }
    .btn {
      background: #444;
      color: white;
      padding: 15px 20px;
      font-size: 24px;
      border-radius: 10px;
      user-select: none;
    }
    .speed-select {
      position: fixed;
      top: 30%;
      left: 50%;
      transform: translateX(-50%);
      background: #222;
      border: 2px solid #555;
      padding: 20px;
      border-radius: 12px;
      z-index: 10;
    }
    .speed-select h2 {
      margin-bottom: 15px;
    }
    .speed-btn {
      margin: 5px;
      padding: 10px 20px;
      font-size: 20px;
      background: #555;
      color: white;
      border: none;
      border-radius: 8px;
    }