OS X V10.7 Lion :: Changing Font Of Popup Dictionary (Look Up)?

I mean this: [URL]. One of the greatest features of Lion I like is the pop-up dictionary. Since I am not a native English speaker, I use this feature a lot, and it is very convenient. But the only thing that bugs me is that I cannot find any way to customise it. The black text on the translucent gray background makes it difficult to read depending on the background of the application. I want to change the background colour and the opacity.The text is too small. It does not change with the text size of the application. I want to enlarge the text size. Is there any way to achieve this or is this another example of Apple's infamous use-it-as-it-is-or-get-lost feature?