[Theme: Mystile] – Centering main nav menu

Hey all,

Was hoping someone who has used the Mystile (WooTheme) might be able to guide me on how to get it centered. This is the CSS i could dig up.

#header #navigation {
background: none repeat scroll 0 center transparent;
border: 0 none;
box-shadow: none;
clear: none;
float: left;
width: auto;
}