Your example looks very nice but I still don't know how to put in the right style for coloring the background.
I found in css analyser "-fx-background-fills" but get all kind of errors when try to add the color.
but I'm not at my computer at the moment. You can put it in the one shot stylefield if that's all you want to do with that Node, or give the Anchorpane or other object an ID or class and add it to a stylesheet.