Design Sets are combinations of fonts and color assignments, which are defined is a *.css file. These *.css files are stored in the directory portals/portalname/design/designsets" of the file system. When selecting a Design Sets in the area
Design & Layout the corresponding file
designset_name.css gets loaded in the database. Each of the Design Sets can be edited individually in the area
Design & Layout. For each modification the file
design/design.css gets rewritten.