Modal window not appearing

I have a filter list that I would like to appear on my shop on the mobile breakpoints. I created fixed position div with a high z-index with shop links, created a button to trigger it, followed the guidelines in this video (and on the official modal blog) - and it doesn’t appear on click.

I’m not sure what the deal is here since the settings I used are the exact same as his. It’s set to hidden, then the interaction switches it to flex, and is supposed to fade it in.

Here is my public share link: LINK
([how to access public share link][2])

This should work: