Refactor dark mode styles for article recommendations section

[liangliangyy]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.79%. Comparing base (c496b93) to head (04852cf).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #882   +/-   ##
=======================================
  Coverage   77.79%   77.79%           
=======================================
  Files          82       82           
  Lines        3985     3985           
=======================================
  Hits         3100     3100           
  Misses        885      885           

Flag	Coverage Δ
unittests	77.79% <ø> (ø)

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