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Scroll interaction addition

Hi, I am in the process of creating a page that uses a scroll interaction based on this excellent tutorial How to Webflow: Switch content with scrolling interactions - Tutorial (2019) - YouTube

The interaction works as it should and can be seen at the top of this page What we do

However, I would like to tweak it so that the blue triangle which is currently overlaid on the scrolling images, remains sticky so it appears attached to the blue rectangle on the left (Coulmn2). In other words on the left would be a blue rectangle with an arrowed point. The images on the right would scroll behind it.

The blue arrow would have to be removed from the actual images of course and I imagine some sort of transparent png of the arrow would be needed. I can’t figure out how to make it work though.

Any help would be amazing! Thanks

This is the share link Webflow - Xpedite

Here is my public share link: LINK
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