Hover affect not working in preview!

Hi everyone!
I have created a style guide page and been testing out webflow.
I wanted to create a text menu where they stack on top of each other. First I tried only using a container and text links. But for the hover effect, I wanted an underline to appear. So, after searching the internet, I created the second list with link blocks and div blocks.
But after I added the animation for the div blocks (the underline), they are fine on the designer, but do not show up when I hover on the preview!
I really don’t know what is going on :confused:
I would really appreciate it if someone took a look and let me know what I did wrong!

Thank you!

Here is my public share link: Webflow - Pegah's Supercool Project