nixos-search: unthemed elements due to ui update

[aemogie]

Is there an existing issue outlining your problem?

• [X] I have searched the existing issues and they do not solve my problem.

What userstyles are you seeing the problem on?

lbl:nixos-search

Describe your problem.

The header bar of the NixOS search site seems to be unthemed, likely due to a change to the website's UI. This could also possibly mean other UI elements are unthemed as well.

Attach screenshots.

What browser(s) are you seeing the problem on?

Firefox v122.0

Any additional comments?

No response

[aemogie]

Just disabled dark reader, and there seems to be more actually.