Personal portfolio example hover event

On the example page in the work section they have a hover event that adds </> around the writing when hovering over the projects,

I know its now needed but it looks snazzy and id like to figure out how this is accomplished, I can see in the code inspector they use a span with the class code adding the symbols but I can see anywhere how to make them appear on a hover event?.

probably using the pseudoelement :hover, but it is difficult to know if you don’t post a link to what you are talking about