Elevation and Shadows
Shadows should be horizontally-centered, but vertically offset, to provide the illusion that a light source is over the top of the screen. The default shadow color should be Shade Black (see Breeze Colors) with 35% opacity. The default size for window shadows is 64px. Menu & tooltip shadows are 16px:
Shadows inside apps should use a size of 16px or below, so as not to compete with the window shadows.