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

.sidebar {
    width: 250px;
    background-color: #f0f0f0;
    padding: 20px;
    height: 100vh;
    overflow-y: auto;
    position: fixed;
    top: 0;
    left: 0;
}

.sidebar-header {
    text-align: center;
    margin-bottom: 20px;
}

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

.sidebar-nav ul li {
    margin-bottom: 10px;
}

.sidebar-nav ul li a {
    text-decoration: none;
    color: #333;
    display: block;
    padding: 8px 0;
    cursor: pointer;
}

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

.main-content {
    margin-left: 260px;
    padding: 20px;
}

.content-section {
    display: none;
}

.content-section h1, .content-section h2 {
    color: #333;
}

.content-section p {
    line-height: 1.6;
}