replace default CSS Styles in AppDev

How to relace or change default Cascarding Style Sheets (CSS) e.g. of the model driven Form Renderer.

1.) open Application Development UI (default: http://localhost:8080/apps/apa/)
2.) Go to Application Permission

3.) change Permissions of "App Cdn" from "Library" to "Full Access"
4.) click "Save Permissions"
5.) under List of Applications, select "App Cdn"
6.) go to File e.g. tcf/gwt/standard/standard.css

8.) click "Save"

Now you can check your changes in Preview Mode of your APP, or publish "App Cdn" to make the changes available to everyone.