How to disable theme's css for plugin

Hi guys,

Can you please visit my blog and check how share buttons are displaying:
http://www.skullspiration.com/skull-tattoo-by-erik-jacobsen/

The main problem is that, theme’s css are overriding plugins css and that’s why all looks rubbish.

Do you know is there any chance to disable theme’s css for this plugin or something like that.

Thank you!
Chris