Scrollable Sticky Dynamic Panel


Hello everyone,
I’m new to this forum but pretty old with Axure. Recently I had a task to do where I have to create a scrollable element that scroll with the main page within its own limits. Pretty hard to explain but I found an example at the below link:

As you can see, the pink - left column, gets sticky at the bottom of the window while scrolling down and sticky at the top of the window while scrolling up. It’s exactly what I need to do with my prototype.

Thanks in advance for your help,