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

.header {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
}

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

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

.sidebar ul {
    list-style-type: none;
    padding: 0;
}

.sidebar ul li a {
    text-decoration: none;
    display: block;
    padding: 10px;
    color: #333;
}

.sidebar ul li a:hover {
    background-color: #ddd;
}

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