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Scrollable Half Screen on CMS

I am trying to create a scrollable section using CMS items. The idea is to split the screen in 2: one part containing an image, the other one, the image’s description.

I want to be able to scroll and see the images move, but keep the text on the right static and change it to match the visible image.

Basically something like this but not infinite scroll:

Any ideas?

Here is my public share link: LINK
(how to access public share link)