how to center a plugin in twenty-eleven theme?

Hello, my website is: https://www.prettydead.com/ and I would like to have the social media plugins at the bottom of the page be centered to make it look better on varying screen sizes.

The plugins I’m using are “Add link to Facebook” and “Sexy Bookmarks”. While Sexybookmarks has an “autocenter” function in their theme, I would like to make all of the plugins that appear in that space centered as only the top bar of icons will actually move to the center when set to do so.

I’m using 3.3.1 and all of the plugins are up to date.

Any help would be appreciated, thanks!