Summary: You want to use another color for the visited links to match the web style in cooperation web sites.
- Locate this string "a:visited" in the default stylesheet in XSLT editor. It can be the XSLT Stylesheet Editor in Search > Search Features > Front Ends > Output Format tab.
- Change and save the color code to the one that you want.
- Test the changes in Test Center.
Additional Information: Please review Changing Variables for more information.