ShareThis plugin – font size

Hi, I have serched this forum but haven’t found the answer yet.
I have installed sharethis plugin (http://bernkopf.ic.cz/)

1) How can I change the size of the font “Read the rest of this article” and “Share this”?
2) How can I delete the space (empty line) between these two?

Thanks for help.
P.S.:I am completely new to WordPress