Fix: select dropdown background colors not visible in light mode

[shamoon]

Proposed change

Fun with css inheritance

Closes #6322

Type of change

• Bug fix: non-breaking change which fixes an issue.
• New feature / Enhancement: non-breaking change which adds functionality. Please read the important note above.
• Breaking change: fix or feature that would cause existing functionality to not work as expected.
• Documentation only.
• Other. Please explain:

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.12%. Comparing base (7afc91e) to head (03333e1).

❗ Current head 03333e1 differs from pull request most recent head e1f785a. Consider uploading reports for the commit e1f785a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6323      +/-   ##
==========================================
- Coverage   98.56%   97.12%   -1.44%     
==========================================
  Files         234      420     +186     
  Lines        7655    16918    +9263     
  Branches     1287     1257      -30     
==========================================
+ Hits         7545    16432    +8887     
- Misses        108      484     +376     
  Partials        2        2              

Flag	Coverage Δ
backend	95.94% <ø> (?)
frontend	98.56% <ø> (ø)

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