body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background: #f4f4f4;
        }
        header {
            background: #2c3e50;
            color: #fff;
            padding: 1.5rem 0;
            text-align: center;
        }
        nav {
            background: #34495e;
            padding: 0.5rem 0;
            text-align: center;
        }
        nav a {
            color: #fff;
            margin: 0 1rem;
            text-decoration: none;
            font-weight: bold;
        }
        nav a:hover {
            text-decoration: underline;
        }
        main {
            max-width: 900px;
            margin: 2rem auto;
            background: #fff;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        footer {
            text-align: center;
            padding: 1rem 0;
            background: #2c3e50;
            color: #fff;
            position: fixed;
            width: 100%;
            bottom: 0;
        }
        @media (max-width: 600px) {
            main {
                padding: 1rem;
            }
             }