How to make Jquery mobile use less space?

I have difficulties figuring out how to make the components of a jquery mobile driven webapp take up less space in a generic way allowing the users to use the app. without scrolling.

I can go in and alter the css for all the elements on the page, but that is not trivial since jquery mobile creates a lot of elements for me.

Is there a way to set some css settings to make the app. use less white space and maybe make the components sizes smaller?