Center The Nav Menu

So I removed the search from the Nav Menu ... and now I'm trying to center it ...

this is what I tried ...

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="HeaderMenu.ascx.cs" Inherits="NopSolutions.NopCommerce.Web.Modules.Navigation.HeaderMenu" %>
<div class="menu">
<div align="center">
    <a href="<%=Page.ResolveUrl("~/Default.aspx")%>"><b>
        <%=GetLocaleResourceString("HeaderMenu.HomePage")%></b></a><img src="<%=Page.ResolveUrl("~/images/sep.gif")%>"
            style="vertical-align: middle;" />
.
.
.
.
</div>
</div>

but its still to the left ...

the code comes from here

Modules\Navigation\HeaderMenu.ascx

Thanks Everyone

Open App_Themes\publicStore\style.css

.menu
{
  text-align:center;
  margin:0px 10px 0px 5px;
  vertical-align:top;
}