Skip Intro button only partly themed

[Fxsch]

Describe what and where does not get themed by Ultrachromic
The Skip Intro button from the intro-skipper plugin only gets partly themed as you can see in the screenshots. Even though this isn't a part of Jellyfin by default, it would still be nice if it got themed. I would do this myself but my Pi isn't fast enough for transcoding and direct playback doesn't work in the browser, so I don't know how to look at the CSS.

Screenshots
Button when not hovering over it

Button when mouse hovers over it