body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f4f6f8;
            color: #333;
        }
        nav {
            background-color: #004aad;
            padding: 10px 0;
            text-align: center;
        }
        nav a {
            color: white;
            margin: 0 20px;
            text-decoration: none;
            font-weight: bold;
        }
        nav a:hover {
            text-decoration: underline;
        }
        header {
            text-align: center;
            padding: 40px 20px;
        }
        main {
            max-width: 800px;
            margin: auto;
            padding: 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
        }
        footer {
            text-align: center;
            background-color: #004aad;
            color: white;
            padding: 15px 0;
            margin-top: 40px;
        }