Issue with Sticky Section

Oi all, basically I’m trying to achieve this layout structure that is prototyped on the XD link below. It’s basically a 10 column, content wrap next to a 2 column, sticky, 100vh content wrap. I was able to build it visually and see it on preview but it didn’t work on a testing site or live site.

Link here.

How would you build a section like this? Could anyone possibly show an example?

PS: My main issue is having the sticky section fit in the same type of grid. With 2 elements that has fixed width I’m able to achieve this. But then it’s quite hard to build it exact with the design and keep it responsive.

Thanks in advance,
Cem