Number of open windows label CSS not working

Looking at this https://docs.xfce.org/panel-plugins/xfce4-docklike-plugin/start#theming and trying the:

/* number of open windows label */
 #docklike-plugin .window_count { color: red; }
 #docklike-plugin .open_group .window_count { color: white; }
 #docklike-plugin .active_group .window_count { color : hotpink; }

But I see no changes. The other bits of code work. Is there a misspelling somewhere?