styling epub3 "tool-tips" in iBooks

i'm making a flowing epub3 right now, and am using noteref links to reference content in <aside> tags as per epub3 specs. ibooks generates fancy tooltips that pop up that contain the content in the <aside>. just wondering if anyone's been able to find a way to style the content in the asides that appear in the tooltip when it pops up. haven't had much luck so far.

suggestions?