NixOS Search: Unthemed elements with prefers-color-scheme: light

### Is there an existing issue outlining your problem?

- [X] I am using the latest version of the provided userstyle.
- [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.

Some areas of the site are unthemed when my system color theme is set to light (meaning the NixOS Search website uses light mode, and I'm guessing some of the selectors used target inline styles or something which would no longer be accurate).

### Attach screenshots.

**Themed with prefers-color-scheme: dark**:

**Some elements unthemed with prefers-color-scheme: light**:

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

N/A

### Any additional comments?

_No response_

Start by locating the userstyle identified by the lbl:nixos-search label and reproduce the NixOS Search page with prefers-color-scheme: light. Compare the themed and unthemed areas shown in the screenshots, then verify that the affected elements are themed in light mode without regressing dark mode.

Written by the indexing model from the issue text.