Make dark mode normal text slightly darker

[Ninjaclasher]

Part of #2035.

Before:

After:

[codecov-commenter]

Codecov Report

Base: 46.81% // Head: 46.81% // No change to project coverage :thumbsup:

Coverage data is based on head (509f764) compared to base (e00396f). Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2181   +/-   ##
=======================================
  Coverage   46.81%   46.81%           
=======================================
  Files         240      240           
  Lines       13211    13211           
=======================================
  Hits         6185     6185           
  Misses       7026     7026           

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