How to have a second navbar be sticky and access all navigation buttons?

I am trying to have a second sticky navigation be attaching itself to the hero navigation which is also at the top when scrolled. The problem I am facing is that both navigation needs to be on the same z-index layer but webflow seems to not recognize this. It needs to understand that both navigation buttons should be accessible at the same time once the sticky is at play.

Unlike the tutorial, in this case, the navigation elements are sharing the same space.How can I tell webflow that they need to be working on the same layer? I tried setting their respective z-index to the same number, but webflow seems to choose whichever navbar to be on top…

Here is my site Read-Only: LINK
(how to share your site Read-Only link)