body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    background: #333;
    color: white;
    padding: 10px 20px;
    text-align: center;
}

header h1 {
    margin: 0;
}

header nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

header nav ul li {
    margin: 0 10px;
}

header nav ul li a {
    color: white;
    text-decoration: none;
}

.container {
    display: flex;
    flex-grow: 1;
}

.sidebar {
    width: 150px;
    background: #333;
    color: #fff;
    padding: 20px;
}

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

.sidebar ul li {
    padding: 10px;
}

.sidebar ul li a {
    color: #fff;
    text-decoration: none;
}

.sidebar ul li ul {
    display: none;
    padding-left: 20px;
}

.sidebar ul li:hover ul {
    display: block;
}

.main-content {
    flex-grow: 1;
    padding: 20px;
    background: #f4f4f4;
}

footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: auto;
}