Docs: CSS library section pages have content horizontally cut off

[jplatte]

Overview of the problem

This is about the Docs.

Description

Many pages in the "CSS Library" section of the docs (e.g. the very first about the Block Element) have their content cut off at the right side of the viewport.

Steps to Reproduce

1. Go go the Block Element docs
2. Adjust viewport to a size normal for a non-ultrawide screen (e.g. 1920 CSS pixels)

Expected behavior

All content of the page should be readable.

Actual behavior

Content is cut off at the right side of the viewport / screen. There is no horizontal scrollbar.