I need to style the dnnLanguage component.

I want to get rid of the standard yellow background color in the dropdownbox.

I tried this using css, I adapted the CssClass of the language control in the admin/Skins/language.ascx file and I created a style with the same name in my skin.css file.

The result of all this is that I can adapt everything but the background - color.

My language.ascx file:
<%@ Control language="vb" AutoEventWireup="false" Explicit="True"         Inherits="DotNetNuke.UI.Skins.Controls.Language" CodeFile="Language.ascx.vb" %>
<asp:dropdownlist id="selectCulture" runat="server" AutoPostBack="true" CssClass="dnnTaalKiezer"> 

style in skin.css:
.dnnTaalKiezer
{
    font-weight:        bold;
    font-size:            90%;
    margin:                10 0 0 0;
}

Can anyone tell me why I can't adapt the background - color in the dropdownbox this way?
Or is there any other way to adapt this background - color?

thanks in advance