Code is less than 80 chars wide

The content area's width of 840px is not sufficiently wide to accommodate 80 characters per line when using Chrome on a completely fresh install of Linux Mint 17.3. Specifically, only 70 characters are displayed per line using this setup.

The same effect is also observed using Chromium, and on Kubuntu 15.10. The issue is thus likely seen in other Chromium-based browsers and on other Ubuntu-based distros as well.

The problem seems to arise due to a slightly larger letter spacing when using the aforementioned combinations, perhaps due to differences in the underlying font rendering engines.

The simplest solution would be to increase the width of the content container (to approximately 950px). Another alternative could be to reduce the letter spacing in the code section (by approximately 0.013em). However, both of these solutions would also affect other platforms where this issue isn't present, perhaps making it somewhat less straight-forward depending on the project's priorities.