FB Like is cropped due to css

Hi, I have the FB Like on my page but when I click the Like button, the popup window (or "flyout") only shows a width as big is the like button it self. See: http://greenjack.nl/?page_id=325 At https://developers.facebook.com/docs/reference/plugins/like/ I read it relates to the used css. Issue also exists with 20/12 theme The solution has to do something with the overflow property... Could you instruct me where to put/change what (custom) css code please.