In an Intrexx layout, you can define your own CSS rules via the menu
item Edit / Add CSS rule. In the Selector
field, enter the selector name. In the CSS appendix, you can find a
short introduction to the various selector types that you can find here
in the application. Under Title, you can give your
own style a name, which will be used for display in the various areas
of the Design module. You can reach the properties
dialog for user-defined CSS rules via the Layout area.