Report Viewer customize Navigation controls color

My window’s background color is almost black, and when there is more than one page on the report the controls for switching pages are not visible. So I would like to know if there is a way to customize the colors of the navigation controls on the Report Viewer component.

I resorted into creating my own navigation controls, but it would be nice to know if there is a way to customize the controls.

Bonus request: Report Viewer’s pageCount is not available when using expression functions; please consider making it available.