[css-multicol] some formatting problems in the document

Hello

2. The multi-column model

The examples format badly because they are neither images nor true
column-examples (that should only be shown in extra tabs after
clicking a button). The layered borders don't fit because my font
makes the text span farther, underneath.

Also, why not just take some text from that chapter instead of that
confusingly hacked and slayed repetitive alphabet?

Appended is a screenshot.

Regards,
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Dennis Heuer
einz@verschwendbare-verweise.seinswende.de