trying to center copyright text in footer

http://www.jbournedesign.com/bce/

I am trying all kinds of CSS to center the text element in the footer (the copyright text). But I am new and cant ge it to work.

when i ‘inspect element’ it says:

<div id="copyright" >
<p class="copyright twocol">© 2013 Bourne Consulting Engineering
</p>

this is the CSS ive added in the theme’s custom CSS area:

#copyright {
text-align: center
}
p.copyright.twocol{
 text-align: center;
 margin-right: auto;
margin-left: auto;
}