why not color was not changed when click on menu item in asp.net

.usermenu {
    color: #800000;
    border-bottom-style: solid;
    border-bottom-width: 3px;
    border-bottom-color: #CC0000;
    height: 50px;
}

<asp:Menu ID="visitor_main_menu" runat="server" Height="50px" Orientation="Horizontal" RenderingMode="Table" ForeColor="#999999" Width="500px" Font-Bold="True"  Font-Names="Cambria" OnMenuItemClick="visitor_main_menu_MenuItemClick">
                    <Items>
                        <asp:MenuItem Text="About-us" Value="About-us" NavigateUrl="~/visitor/aboutus.aspx"></asp:MenuItem>
                        <asp:MenuItem Text="Home" Value="Home" NavigateUrl="~/visitor/visitorhome.aspx"></asp:MenuItem>
                        <asp:MenuItem Text="Sign-up" Value="Sign-up" NavigateUrl ="~/visitor/signup.aspx"></asp:MenuItem>
                        <asp:MenuItem Text="Login"  Value="Login" NavigateUrl="~/visitor/userloginpage.aspx"></asp:MenuItem>
                        <asp:MenuItem Text="Search" Value="Search" NavigateUrl ="~/visitor/visitorsearch.aspx"></asp:MenuItem>
                        <asp:MenuItem Text="Contact-us" Value="Contact-us" NavigateUrl="~/visitor/contactus.aspx"></asp:MenuItem>
                        <asp:MenuItem Text="Feedback" Value="Feedback" NavigateUrl="~/visitor/feedback.aspx"></asp:MenuItem>
                    </Items>

                    <StaticHoverStyle CssClass="usermenu" ForeColor="#CC0000" />
                    <StaticSelectedStyle ForeColor="#CC0000"  CssClass ="usermenu"/>