Long modal window not scrolling

I’ve been following Waldo’s modal tutorial, but I have the following issue. My modal window needs to contain very long and scrollable content, but I can’t seem to get it to work. Here is a public link of my website:

https://preview.webflow.com/preview/pixel-bazaar?preview=6e52130fcc106563afcc683d95a4a1a7

I set the modal container to Position: Fixed, and I think that makes the whole problem, although the actual box for the modal content is set to Position: Absolute, with Overflow: Scroll, like suggested. Any help how to make this work?

Apparently with some changes of my own, I made it to work. Was I supposed to add custom JS code? Because I didn’t, yet it works.