Why this is not working?

Question

I want the links to be underlined if they are visited.
https://code.sololearn.com/WUuVO8RpxLOe/?ref=app

Answer 1

Looks ok to me...

Answer 2

It seems you cant change the link style, depending on the browser (maybe for security reasons) . You can change and keep the color though.

I tested using this:
a.nav:visited{
color:red;
text-decoration:underline;
}

This article seems to be related:
https://stackoverflow.com/questions/20640731/visited-links-wont-underline