Gtk3 CSS GtkTreeView column header color

[john beritz <jberitz@xxxxxxxxx>]

I'm using gtk+-3.2.3 with css on Ubuntu natty. In the code below I have a
 button that starts out with a background color of green with blue text.
 I set the background color for the hover state to red but the font 
color will not change to white as I've specified.
Also for the active:hover state the background color changes but the font 
color won't change to cyan that I've specified.
( I used hex for cyan, using the named color cyan is broken, same for silver http://en.wikipedia.org/wiki/X11_color_names )
Why is this happening? 
Is this the window manager over-riding my code?

/*Compile with:
  gcc -Wall -o cssbutton2 `pkg-config --cflags --libs gtk+-3.0` cssbutton2.c
*/

#include <gtk/gtk.h>

int main(int argc, char *argv[] )
{
  GtkWidget *window;
  GtkWidget *button;
  GtkCssProvider *provider;
  GdkDisplay *display;
  GdkScreen *screen;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_default_size(GTK_WINDOW(window), 280, 200);
  g_signal_connect (GTK_WIDGET (window), "destroy",
                        G_CALLBACK (gtk_main_quit), NULL);

  button = gtk_button_new_with_label("CssButton");  
  gtk_widget_set_name (GTK_WIDGET(button), "mybutton");        
  gtk_widget_set_halign (GTK_WIDGET(button),GTK_ALIGN_CENTER);
  gtk_widget_set_valign (GTK_WIDGET(button),GTK_ALIGN_CENTER);
  gtk_widget_set_size_request(GTK_WIDGET(button), 200, 120);
  gtk_container_add(GTK_CONTAINER(window),button); 

  provider = gtk_css_provider_new ();
  display = gdk_display_get_default ();
  screen = gdk_display_get_default_screen (display);                                                                                  
  gtk_style_context_add_provider_for_screen (screen, GTK_STYLE_PROVIDER (provider), GTK_STYLE_PROVIDER_PRIORITY_USER);

  gtk_css_provider_load_from_data (GTK_CSS_PROVIDER (provider),
                            " GtkWindow {\n"                          
                            "   background-color: tan;\n"
                            "}\n"
                            " GtkButton {\n"
                            "   -GtkWidget-focus-line-width: 0;\n"
                            "   border-radius: 15;\n"
                            "   font: Sans 23;\n"
                            "   color: #00008B;\n"                                       
                            "   background-color: green;\n"
                            "}\n"
                            " .button:hover {\n"
                            "   background-color: red;\n"
                            "   color: white;\n"
                            "}\n"
                            " .button:hover:active {\n"
                            "   background-color: orange;\n"
                            "   color: #00FFFF;\n"
                            "}\n", -1, NULL);

  g_object_unref (provider);
  gtk_widget_show_all(window);
  gtk_main();
  return(0);
}

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