style.css

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

.container {
    display: flex;
    width: 100%;
}

.toc {
    width: 20%;
    background-color: #f4f4f4;
    padding: 20px;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
    position: fixed;
    height: 100%;
    overflow-y: auto;
}

.toc h2 {
    font-size: 1.5em;
    margin-bottom: 10px;
}

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

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

.toc ul li a {
    text-decoration: none;
    color: #333;
}

.toc ul li a:hover {
    text-decoration: underline;
}

.content {
    margin-left: 30%;
    margin-right: 10%;
    padding: 30px;
    width: 80%;
}

.content h1 {
    font-size: 2em;
    margin-bottom: 20px;
}

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

.content section h2 {
    font-size: 1.5em;
    margin-bottom: 10px;
}