body {
      font-family: Arial, sans-serif;
      margin: 0;
      background-color: #f4f4f4;
      color: #333;
    }

    header, footer {
      background-color: #004080;
      color: #fff;
      padding: 1em 2em;
      text-align: center;
    }

    nav {
      background-color: #0066cc;
      padding: 0.5em;
      text-align: center;
    }

    nav a {
      color: white;
      margin: 0 15px;
      text-decoration: none;
      font-weight: bold;
    }

    nav a:hover {
      text-decoration: underline;
    }

    main {
      max-width: 800px;
      margin: 2em auto;
      background: #fff;
      padding: 2em;
      border-radius: 10px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }

    h1 {
      color: #004080;
    }

    ul {
      list-style-type: square;
      padding-left: 1.5em;
    }

    footer small {
      color: #ccc;
    }