Hi Pontus,
Either create a custom skin for the RadAjaxLoadingPanel
http://www.telerik.com/community/code-library/aspnet-ajax/ajax/how-to-create-and-use-custom-skins-for-radajaxloadingpanel.aspx
or override the background color in the Simple skin
http://blogs.telerik.com/dimodimov/posts/08-06-17/how_to_override_styles_in_a_radcontrol_for_asp_net_ajax_embedded_skin.aspx
div.RadAjax_Simple .raColor
{
background-color: #000;
}
Regards,
Dimo
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