This is a basic sidebar, for a menu/table of contents. You can see an example in this page.
<div class="sidebar-container"> <label for="toggle-sidebar">Mobile toggle for the sidebar</label> <input type="checkbox" id="toggle-sidebar"> <div class="sidebar"> <ul class="nav"> <li><a href="#">Go to the top</a></li> <li class="section">Section</li> <li><a href="#">A link</a></li> </ul> </div> <div class="content"> <p>Hello world!</p> </div> </div>