What would be the easiest way to do a list of skills on a page that open in a popup?

I’m trying to list a bunch of skills on my website and have each of them open in a pop-up on click to give a little more info.
Basically, I want it to look like this, not as a button.
Image for reference

I’ve tried some codes from the internet but they either don’t work or break my WordPress theme.

The closest I’ve gotten was with this piece of code:

“Example code“