Mobile menu broken on commit view

When viewing a single commit using Chrome on Android, the menu does not hide so you cannot see any of the page content.
Steps to reproduce:
From the commit page click any single commit.
What happens: the page loads write the menu covering the page content.
What I expect to happen: the page should load and the menu should hide with a hamburger menu button to show when needed.

Also the CSS on this page does not use 100% width so it is hard to read.