body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #fafafa;
  }
  header, footer {
    background-color: #333;
    color: #fff;
    padding: 1em;
    text-align: center;
  }
  nav ul {
    list-style: none;
    padding: 0;
  }
  nav ul li {
    display: inline;
    margin: 0 1em;
  }
  main {
    padding: 1em;
  }
  #controls {
    margin-bottom: 1em;
  }
  canvas {
    border: 1px solid #ccc;
    margin: 0.5em 0;
    display: block;
  }