body {
    font-family: Arial, sans-serif;
  }
  
  header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px;
  }
  
  nav ul {
    display: flex;
    justify-content: space-around;
    background-color: #444;
    color: #fff;
    padding: 10px;
  }
  
  section {
    padding: 20px;
    text-align: center;
  }
  
  section h2 {
    font-size: 1.5em;
  }
  
  section button {
    margin-top: 10px;
  }
  
  footer {
    background-color: #222;
    color: #fff;
    padding: 20px;
    text-align: center;
  }