only style scrollbar for devices that support hovering; otherwise, they most likely are touch devices that should
use the native scrollbar.
this is necessary since for some reason chromium uses the native scrollbar for the window scrollbar and the
styled non-native scrollbar for element scrollbars on those devices
While iOS does not support customizing the scrollbar, it seems there is a bug when the width and/or height gets set.
(see MediaQuery#getScrollbarSize) When inserting an empty div with forced scrollbars and calculating the scrollbar size, for some reason on iOS it has a scrollbar that affects the available size, which is not possible.
