Background of popup doesn't show up

Hi, I have created a popup, everything worked fine. A few days later now I checked the website again and the popup don’t have dark background behind it. I don’t know the reason since I didn’t change anything (I believe).

Video showcase: https://www.loom.com/share/6b5408d035ce4ecaae223b648a4d996c


Here is my public share link:

https://preview.webflow.com/preview/viktor-madic?utm_medium=preview_link&utm_source=designer&utm_content=viktor-madic&preview=9f61eb715bfc11dd0aa6e68a8d96b354&pageId=5eb6c415f92b5870fd10e2a8&mode=preview