Fix #666

[grst]

Closes #...

• CHANGELOG.md updated
• Tests added (For bug fixes or new features)
• Tutorial updated (if necessary)

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.38%. Comparing base (ae513a8) to head (86fb527).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scirpy/pl/styling.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #667      +/-   ##
==========================================
+ Coverage   19.29%   19.38%   +0.08%     
==========================================
  Files          51       51              
  Lines        4607     4612       +5     
==========================================
+ Hits          889      894       +5     
  Misses       3718     3718              

Files with missing lines	Coverage Δ
src/scirpy/pl/styling.py	30.35% <66.66%> (+6.82%)	⬆️

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