Help trying to replicate the new Intercom navbar

Hi! I’m trying to replicate the new Intercom navbar and behavior (seen here) and in the first 2 images below.

Intercom:

My attempts:

I’m having trouble setting the dropdown menu to an absolute value that is associated with the body rather than the navbar. Because the Navbar has to be fixed, the dropdown menu is absolute relative to the navbar and not the body. As a result, I’m struggling to find an absolute value positioning that reflects the end result Intercom has achieved.

Thank you for your support!


Here is my site Read-Only: LINK