Link attributes in editing pane

What in the CSS needs to be changed to make links in the editing pane display as distinctly being links (e.g., the traditional blue with underline). Right now, when writing or editing a page/post, it’s impossible to tell what is and is not linked text without hovering over every word.

As this is only a problem in 2 blogs using Customizr (out of about a dozen I work with), I must assume it’s a result of the admin CSS in this theme.