Is there an existing issue outlining your problem?

• I am using the latest version of the provided userstyle.
• I have searched the existing issues and they do not solve my problem.

What userstyles are you seeing the problem on?

lbl:lichess

Describe your problem.

Originally from #1763. The following UI areas are unthemed:

• Hamburger menu icon
• Hamburger menu headers/sections
• Settings menu item hovers
• Stockfish configuration buttons
• Sign in, register page (input borders, sign in button)

Attach screenshots.

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

N/A

Any additional comments?

No response