I have a Ext Window with column layout inside. One of the columns has form layout and a combo field, which looks like this (combos are removed the down-arrow image)

dialog.png

How do I set the background color of the form to be according to the theme that is currently loaded? I can adjust it with CSS to match the color of the window, but when I change theme, it stays in that color, which I don't want. Or maybe someone can suggest different approach from the one that I'm using at the moment.

Thanks in advance.