body {
    margin: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

#navbar {
    position: fixed;
    left: 0;
    top: 0;
    width: auto;
    height: 100vh;
    border-right: 1px solid #ccc;
    background-color: #f4f4f4;
    overflow-y: auto;
}

#navbar header {
    font-size: 22px;
    padding: 15px;
    font-weight: bold;
    border-bottom: 1px solid #ccc;
}

.nav-link {
    display: block;
    padding: 10px 15px;
    text-decoration: none;
    color: black;
    border-bottom: 1px solid #ddd;
}

.nav-link:hover {
    background-color: #ddd;
}

#main-doc {
    margin-left: 290px;
    padding: 20px;
}

.main-section {
    margin-bottom: 40px;
}

.main-section header {
    font-size: 24px;
    margin-bottom: 10px;
}

code {
    display: block;
    background-color: #eee;
    padding: 8px;
    margin: 10px 0;
    border-radius: 4px;
}

ul {
    margin-left: 20px;
}

@media (max-width: 640px) {
    #navbar {
        position: relative;
        width: auto;
        height: auto;
    }

    #main-doc {
        margin-left: 0;
    }
}