In addition to : .invisible to the themes
|Reported by:||hakre||Owned by:|
|Component:||Themes||Keywords:||has-patch tested commit|
in  a new css class (.invisible) has been introduced in the backend.
because there is not strict seperation of backend and frontend code, there is need to have it in the default frontend css as well.
attached you find a patck for the classic and default theme introducing this class.