title: Put shaded box around Facebook "like" button to make it look centered
body: <p>I have a Facebook like button on my site. The site, however, uses primarily content that's centered on the page, and the button is stubbornly left-justified. I've set a custom width on the button to get it more or less centered, but of course the width changes, and sometimes the nominal width includes more or less white space. This makes it look like it isn't centered.</p>
  
  <p>I think if I could get the whole 450px wide by arbitrary height (changes if profile pics of people who liked it appear) region to be shaded it'd look better and feel less off-center. How is this possible?</p>