Minor change to background color of the tabs

[cwognum]

Minor change, which I think improves readability and looks a bit nicer.

Before

After

[codecov[bot]]

Codecov Report

Merging #193 (c6db727) into main (6020ec0) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #193   +/-   ##
=======================================
  Coverage   91.47%   91.47%           
=======================================
  Files          46       46           
  Lines        3672     3672           
=======================================
  Hits         3359     3359           
  Misses        313      313           

Flag	Coverage Δ
unittests	91.47% <ø> (ø)

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[hadim]

Thanks!