    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        .container {
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        header {
            background-color: #4CAF50;
            color: white;
            padding: 1rem;
            text-align: center;
        }

        nav {
            background-color: #333;
            color: white;
            padding: 1rem;
            text-align: center;
        }

        nav a {
            color: white;
            margin: 0 1rem;
            text-decoration: none;
        }

        .breadcrumb {
            background-color: #f1f1f1;
            padding: 0.5rem 1rem;
        }

        .breadcrumb a {
            color: #4CAF50;
            text-decoration: none;
            margin-right: 0.5rem;
        }

        .main {
            display: flex;
            flex: 1;
        }

        .content {
            flex: 3;
            padding: 1rem;
        }

        .sidebar {
            flex: 1;
            background-color: #f1f1f1;
            padding: 1rem;
        }

        .footer-nav {
            background-color: #333;
            color: white;
            padding: 1rem;
            text-align: center;
        }

        .footer-nav a {
            color: white;
            margin: 0 1rem;
            text-decoration: none;
        }

        footer {
            background-color: #4CAF50;
            color: white;
            text-align: center;
            padding: 1rem;
        }

        .copyright {
            background-color: #333;
            color: white;
            text-align: center;
            padding: 0.5rem;
        }

        @media (max-width: 768px) {
            .main {
                flex-direction: column;
            }

            .content {
                order: -1;
            }
        }
    </style>