html, body {
      margin: 0;
      padding: 0;
      height: 100%;
      overflow: hidden;
    }

    canvas {
      display: block;
    }

    .controls {
      position: absolute;
      top: 10px;
      left: 10px;
      background: rgba(255, 255, 255, 0.8);
      border-radius: 10px;
      padding: 10px;
      font-family: sans-serif;
      z-index: 1;
    }

    .controls label {
      display: block;
      margin-bottom: 8px;
      font-size: 14px;
    }

    .controls input[type="range"] {
      width: 150px;
    }