Some of the users of my forum have trouble to see the difference between "visited links" and "non visited links" on the forum and need a greater contrast. So I need to change at least one of the colors.

I have looked at the files style.css and style.min.css in the folder themes\default but I'm not sure where to change. Is #00c the color to change in order to change the color of visited links? Which color has non visited links?

Best regards,
Daniel