Spotify unthemed background behind sidebar elements

[Insprill]

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:spotify-web

Describe your problem.

The background behind the Home/Search panel and the Your Library panel isn't themed, which is visible at the rounded corners and the gap between panels.

Attach screenshots.

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

Firefox v125.0.1

Any additional comments?

No response