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

.layout {
    display: flex;
}

.toc {
    width: 250px;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    padding: 20px;
    background: #f5f5f5;
    border-right: 1px solid #ddd;
}

.content {
    margin-left: 300px;
    padding: 20px;
}