Use more realistic colors

[gipert]

Closes #118.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.84%. Comparing base (fb0e5f8) to head (52698b9).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   91.84%   91.84%           
=======================================
  Files          14       14           
  Lines        1766     1766           
=======================================
  Hits         1622     1622           
  Misses        144      144           

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