body {
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 0;
    }

    header {
      background-color: #f2f2f200;
      padding: 20px;
      text-align: center;
    }

    nav ul {
      list-style-type: none;
      margin: 0;
      padding: 0;
      overflow: hidden;
      background-color: #333;
    }

    nav li {
      float: left;
    }

    nav li a {
      display: block;
      color: white;
      text-align: center;
      padding: 14px 16px;
      text-decoration: none;
    }

    nav li a:hover {
      background-color: #111;
    }

    main {
      padding: 20px;
    }

    footer {
      background-color: #333;
      color: white;
      padding: 20px;
      text-align: center;
    }