It’s not glitching, I see the results without flickering. Now as I play with it, some parts of the UI are disappearing and my computer starts to suffer.
As you can see on this capture, even with a very low alpha, it’s still covering a lot. I don’t know if you realize but as you’ve set this div inside of an item, and make it relative to the viewport, you’re presented with not just this div, but to a pile of as many divs as items in your list. So your browser is processing alpha for 100 full screen divs. A Fixed div is already very demanding for a browser and a processor to handle, because for every pixel you scroll, the rendering of your page must be redone.
What happens to you is you’re overloading your computer and your browser. You make them handle 2 already difficult things at once: 1/ a large number of elements and 2/ alpha transparency.
I suppose that you only intend to show one of these div at a time, so figure out a way to style this div outside of the list, make it hidden, paste it in the list item, and build your IX to reveal it, making sure the IX targets only one div at a time.
Kudos for creating a logic bomb in Webflow though