body {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #f5f5f5;
    font-family: sans-serif;
    margin: 0;
    height: 100vh;
  }
  .controls {
    margin: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
  }
  canvas {
    border: 1px solid #ccc;
  }