Aligning an Authorize.Net element to the center

I have this Authorize.net element on my page, which is basically authorizing my site for payment, which basically a开发者_运维技巧uthenticates my site as an authorize.net merchant, but I can't find out how to center it, as I think it looks better this way in my right column, rather than aligned to the left.

Here is the page: http://www.marioplanet.com

It is on the right column like I said.

Thanks!!

margin:0 auto on the div with the explicit width set should center it.