Portfolio Style Popup Transparency Issue

Hello! I am relatively new to Webflow but love it. Currently I am building out a portfolio site, and running into a transparency issue.

Following the guide here to create a popup-style window for portfolio items, however when trying to get the popup to be transparent, it does so in “stages”, and not overall on the page. I’ve tried messing with the Z-index of several things, all to no avail. It only seems to happen when I apply transparency to that overlay DIV.

Hoping someone smarter than I can shed some light. Thank you.

Screenshot here:


Here is my site Read-Only link.