[repo] Address issues with dark mode (fixes #1384)

[andrewnicols]

No description provided.

[Copilot]

Pull Request Overview

This PR addresses dark mode styling by introducing a custom background color variable.

• Adds a new CSS variable for the dark mode background color.

Comments suppressed due to low confidence (2)

src/css/custom.css:48

• [nitpick] Consider adding a comment above this line to explain the choice of #1b1b1d and how it integrates with the overall dark theme palette.

  --ifm-background-color: #1b1b1d;

src/css/custom.css:48

• It would be helpful to add a visual regression test or CSS snapshot test to verify that the background color is applied correctly in dark mode.

  --ifm-background-color: #1b1b1d;

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[HuongNV13]

Thanks, Andrew!
The changes look right to me!