PlatformPro’s WordPress framework comes standard with flush-left navigation. We wanted the menu to be centered. We’re working with PlatformPro’s child theme, PlatformBase.

WordPress version: 3.1.2
PlatformPro version: 1.3.5
PlatformBase version: 1.3.2

Add the following CSS to PlatformBase’s “base.css” file:

#nav_row ul{padding-bottom:10px !important;float:none !important;text-align:center;}
#primary-nav li{float:none !important;display:inline !important;}
#primary-nav a{float:none !important;display:inline !important;}

http://www.pagelines.com/forum/topic/5906 (must be logged in)