A skin rule is an instance of the Rule-PortalSkin rule type. It defines a skin — a collection of styles — that determine the presentation of your application, including colors, fonts, images, and layout of portal, work forms, and report displays.
Skin rules are referenced in portal rules. To view all the skin rules available in the system, as well as portals in use by the current and built-on applications, their associated skins, and the access groups and operators that use them, see Skins & Portal landing page. You can open skin rules from this page.