Can't navigate Github pages documentation when window is too small

[rfriedman22]

When the webpage for the documentation is large, the different pages (Overview, Background, Installation, etc.) appear as a sidebar on the left. However, if the web browser page is small enough, this sidebar gets shrunk to a sandwich icon. I can click on this icon, but the entire page gets dimmed and I cannot click on any of the items in the menu that appears. This is also the behavior when viewing from a mobile browser.