How to keep a page active when overlay is active in prototype mode?

Hello everyone!

I am trying to figure the following interaction out for a e-commerce comparison screen, but not able to achieve it. Any pointers will be super helpful.

  1. User clicks on compare button and that opens up a pop up that stays sticky at the bottom of the page. - No issues with this step.

  2. User minimizes the compare container - again no issues

  3. User goes back to the page to browse more products and add another product while the pop up is active. - I am not able to achieve this interaction. The problem I am facing is that when the pop up is active I am not able to scroll through the page behind it.

Is there any way to achieve interaction on pt 3 using pop ups ?