You can set the body ID or class after the editor has loaded (there's an event) and also set an event handler to watch for any changes between source and design mode (that would make your body lose its properties).
You just have to pickup then an Id or class that matches the element where the content will be displayed so you have the proper background and text color.
I think that there was a patch to do this change permanent
RE: change background
You just have to pickup then an Id or class that matches the element where the content will be displayed so you have the proper background and text color.
I think that there was a patch to do this change permanent