You can scroll on the parts of the page... that scroll. The side bar and app bar are fixed (just like in GMail and a bunch of other Google properties now) so naturally the mouse wheel won't scroll them or the page.
You can scroll on the parts of the page... that scroll. The side bar and app bar are fixed (just like in GMail and a bunch of other Google properties now) so naturally the mouse wheel won't scroll them or the page.