body {
            font-family: Arial, Helvetica, sans-serif;
            margin: 0;
            padding: 0;
            background: #f5f5f5;
            color: #333;
        }
        header {
            background: #222;
            color: #fff;
            padding: 1rem;
            text-align: center;
        }
        main {
            max-width: 800px;
            margin: 2rem auto;
            padding: 1rem;
            background: #fff;
            border-radius: 6px;
        }
        footer {
            text-align: center;
            font-size: 0.9rem;
            color: #777;
            margin: 2rem 0;
    }