body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background: #f9f9f9;
    color: #333;
  }
  
  header {
    background: #222;
    color: white;
    padding: 2em;
    text-align: center;
  }
  
  nav a {
    margin: 0 1em;
    color: #9cf;
    text-decoration: none;
  }
  
  nav a:hover {
    text-decoration: underline;
  }
  
  main {
    max-width: 800px;
    margin: 2em auto;
    padding: 0 1em;
  }
  
  footer {
    text-align: center;
    margin: 2em 0;
    font-size: 0.9em;
    color: #666;
  }