Custom link button colour(s) affected by dark mode

[Azmodeszer]

Deployment Type

Self-hosted

NetBox Version

v4.0.2

Python Version

3.11

Steps to Reproduce

1. Create a custom link with Button class "White".
2. Enable dark mode.

Expected Behavior

Button stays white.

Observed Behavior

Button turns black.

[Andres1357]

Same bug with White, Gray or Black.
There's a similar issue with Default and Link class links where they become invisible in dark mode.

[jeremystretch]

I believe we're missing custom CSS classes for .btn-white and .btn-black.

[ljarasius]

I'm happy to take this one @jeremystretch