Apologies if this is a bit hard to understand.
Some sites have a background that fills the screen… until you scroll. There’s one on my work’s intranet, so obviously I can’t use that as an example. But I see the same thing on my Lemmy instance, db0 (not mine mine, the one I use). They made this thing, I think it’s meant to be a black hole, heavily blurred, but when I scroll, the image scrolls away.
Is there some way to lock the background in place and let the content just scroll past it? Maybe with a setting, or more likely with an extension?
For me the image stays there the whole time.
You could try using an extension like stylus to change the css on the page to make the image behave how you like, but you’d need some knowledge of how css works.