CSS Help — Any way to remove the background slideshow?

[classicfilms]

TLR, I want to have specific backgrounds on the details page of each movie/show/etc. But I want to be able to choose just one background image for the other pages, including home and the various libraries. Is this possible?

I love having backgrounds on the details page of a movie/show/etc. It really brings those pages to life. Doing so, however, creates a random slideshow (pulled from all the background images) on the other pages, including home and library.

Some background images work on these pages and some really really don't.

I'd love to keep the backgrounds I've chosen for each detail page AND also choose a single image to use on the other pages. Is this even possible?

I know I can point to a background image (via a URL) in the CSS. But that image is then also used on all the details pages. Which is not my goal.

I've been diving deep into the CSS of several user themes. But I've yet to discover a solution for my needs.

I love how much I can custom Jellyfin. And other people have done some amazing things with CSS customization. Which makes me feel like there should be a way to accomplish the above.

Any help would be greatly appreciated.

MacOS Sequoia 15.31.1
Jellyfin 10.10.6
Jellyfin Media Player (not sure where to find the version)

[Wanjubing]

#indexPage {background: #101010;}
or
#indexPage {background:url('https://xxx/xxx.jpg');}