Shortcode within Content

Hi,
Using the shortcode within content [pinit] works just fine, but it always left aligns on the page. I am trying to center it on the page…I have tried adding [pinit float=”center”]. That doesn’t work. Any ideas on how to center the pin it button using shortcode within content?

Thank you in advance.

Lori

http://wordpress.org/extend/plugins/pinterest-pin-it-button/