require 'gtk'

Gtk::RC.parse_string <<EOS
style "button"
{
  bg[NORMAL] = {1.0, 0.8, 0.8}
}
widget_class "*GtkButton" style "button"
EOS

window = Gtk::Window.new(Gtk::WINDOW_TOPLEVEL)
button = Gtk::Button.new('Hello World')
window.add button
button.show
window.show
Gtk.main