CSS Style window background beyond page on Mac possible?

Is it possible to style or color the window pane background of the browser?
When scrolling beyond the edge in Chrome and Safari on Mac,
the whole page is pulled a bit down and/or sideways.

It shows a basic canvas style of texture,
is it possible to style that region (with CSS) ?

Edit: i found a (crude) way to prevent the overscrolling entirely,
but i'm looking for a way to set a color or texture, to match the overall design.
Prevent "overscolling" of web page