Pygments 2.12.0 slightly changed the order of HTML elements which
makes line numbers look weird with current CSS styles.
Quoting changelog:
> When linenos=table is used, the <table> itself is now wrapped
> with a <div class="highlight"> tag instead of placing it
> inside the <td class="code"> cell (#632.) With this change,
> the output matches the documented behavior.
https://pygments.org/docs/changelog/#version-2-12-0
Related issue: https://github.com/pygments/pygments/issues/632
This commit aims to fix this by further restricting CSS selectors
that selected everything under .highlight to only select source code
related elements - descendants of .code in the new layout.
This was also tested on Pygemnts 2.14.0, version currently packaged
for Debian Bookworm
https://packages.debian.org/bookworm/armel/python3-pygments
4779965e0f