Help! - Inline "sticky" box within horizontally scrollable content?

So I am trying to create a sticky object within a horizontally scrolling unit. Im not sure waht this interaction would be called and im trying to replicate in webflow so i can try and repeat some code for a div class to eventually customize some Axure code. Essentially in this project im trying to get the red box to stay on the right of the view area as the black scrollable content scrolls horizontally. Im trying to keep this all relative to a single container within the view area.

Webflow - Chris Grant's Superb Project

Yep that does it thank you, unfortunately it seems as though i need to go “outside” of the container I was trying to work within (I was hoping to do this within children of viewpane). But if this is the way to do it, I will see if I can translate.