Center menu items on Mobile

Hi,

I've used the CSS code you share on this discussion http://forum.muffingroup.com/betheme/discussion/170/any-suggestion-how-to-center-menu-using-stack-center but r didn't worked for me.

This is teh CSS code I've added:

/*ALIGN MENU ITEMS CENTER ON MOBILE*/

#Header .menu > li { display: inline-block; float: none;}
#Top_bar #menu { width: 100% !important; }
#Top_bar .menu_wrapper { text-align: center; width: 100%; }
#Top_bar .top_bar_left { width: 100% !important; }
.header-stack #Top_bar .top_bar_right { display: none; }

Thanks