fix foreground color of the button on error page

[fatadel]

Closes #5844.

Before

Profile

After

Profile

Notes

I've made it look the same way as it used to look before it got broken in this PR. This is how it looked before that PR:

However, I am not sure if this even looks nice.

Use these instructions to hit an error and see the page live.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.56%. Comparing base (37b31b0) to head (0246438).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5849   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files         319      319           
  Lines       31420    31420           
  Branches     8661     8663    +2     
=======================================
  Hits        26885    26885           
  Misses       4104     4104           
  Partials      431      431           

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