body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
        }

        header {
            background-color: #4CAF50;
            color: white;
            text-align: center;
            padding: 10px 0;
        }

        #container {
            display: flex;
            height: 100vh;
        }

        #menu {
            width: 200px;
            background-color: #f4f4f4;
            padding: 15px;
            box-shadow: 2px 0 5px rgba(0,0,0,0.1);
        }

        #menu a {
            display: block;
            color: #333;
            text-decoration: none;
            padding: 10px 0;
            margin: 5px 0;
            border-bottom: 1px solid #ddd;
        }

        #menu a:hover {
            background-color: #ddd;
        }

        #main {
            flex-grow: 1;
            padding: 20px;
        }

        footer {
            background-color: #333;
            color: white;
            text-align: center;
            padding: 10px 0;
            position: relative;
            bottom: 0;
            width: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
        }