Issue in ASP.Net menu control implementation

I am implementing ASP.Net menu control  in our application. I want to highlight with color to selected menu item after the post back in menu control.  I have added the style color in Style.css file, and setting the CssClass name as mentioned below.

<asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="true" IncludeStyleBlock="false" Orientation="Horizontal">

                    <Items>

                        <asp:MenuItem NavigateUrl="~/UI/Accounts.aspx" Text="Accounts"/>

                        <asp:MenuItem NavigateUrl="~/UI/Messages.aspx" Text="Messages"/>

                    </Items>

                   <staticselectedstyle  CssClass="staticSelectedStyle" />                   

                   <StaticMenuItemStyle CssClass="staticMenuItemStyle" />

                </asp:Menu>

           But this is not affected the selected menu item color change. Please suggest me any solution.

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