Navigation menu/table of contents covers content (on Chromium Browser)

[tillkamppeter]

I am browsing around in the snap documentation and found the "snap-codelabs" tutorial snap to be used via http://localhost:8123/. So as an experienced http://localhost:631/ user I called this link in Chromium, the browser I usually use (the version which comes with Ubuntu Yakkety).

The start page is OK, but if I enter an arbitrary tutorial, The table of contents in the upper left covers the left edge of the tutorial content making it unreadable.

On Firefox (also on Yakkety) the problem does not occur.