I had to do this recently, and rather than trying to remove styling from one of the built-in themes, I found it was easier to define my own (by picking any them

I had to do this recently, and rather than trying to remove styling from one of the built-in themes, I found it was easier to define my own (by picking any theme name but 'a', 'b', or 'c'), like this: <div data-role="page" data-theme="n"> ... </div> This will retain all the layout styles, but give you a fresh start on the rest, so you aren't trying to undo drop shadows, circular buttons, etc. You'll need to include `data-theme="n"` on the divs with header, footer, and panel roles also. My email is in my profile if you'd like to ask any other questions; I'd be happy to help.