Hmmm.. That's an excellent question. Unfortunately, right now, we use the same style on the top and bottom for the surrounding div of "scsocialbuttons". I've added a task to our bug tracker to extend that to be "scsocialbuttons bottom" or "scsocialbuttons top" so that you can easily target the individual widgets within the div.
That probably won't be available until our next big release (August/September) timeframe. If you absolutely need something before then, let us know and I can come up with a code change that should work. It will take a little bit of effort on your end to make the modifications though.
If so, just let us know, and I can hopefully get you something in a few days.
Thanks,
Alex