Add CSS class(es) Interface

Hi,

I really like that plugin, it is very usefull but,
From the interface of plugin , IO want to change color of the external links. I see that section “Add CSS class(es):” But I am not sure what I am going to write there to change the color of internal link or add a pop up to give an idea of that link (For ex.the external links like here: https://www.healthline.com/health/beauty-skin-care/bumps-after-waxing#home-and-natural-remedies)

Tnak you so mjuch