Ruby GTK modify widget colors

Hello,

I want to modify the widget colors in GTK3. I only found an example with 
GTK2.

With GTK3 it doesn't work.

Has someone a solution?


Regards

UH

require  'gtk2'

window=  Gtk::Window.new
window.set_size_request(300,200)

button=  Gtk::Button.new('Button')
button.set_size_request(100,-1)

font=  Pango::FontDescription.new('28')
button.child.modify_font(font)

yellow=  Gdk::Color.new(65535,65535,0)
cyan=  Gdk::Color.new(0,65535,65535)
green=  Gdk::Color.new(0,65535,0)
magenta=  Gdk::Color.new(65535,0,65535)
white=  Gdk::Color.new(65535,65535,65535)
blue=  Gdk::Color.new(0,0,65535)

# background color of the button
button.modify_bg(Gtk::STATE_NORMAL   , yellow)
button.modify_bg(Gtk::STATE_PRELIGHT,   cyan)
button.modify_bg(Gtk::STATE_ACTIVE   ,  green)

# label color of the button
button.child.modify_fg(Gtk::STATE_NORMAL   , magenta)
button.child.modify_fg(Gtk::STATE_PRELIGHT,    blue)
button.child.modify_fg(Gtk::STATE_ACTIVE   ,   white)


fixed=  Gtk::Fixed.new
fixed.put(button,10,10)
window.add(fixed)

window.show_all
window.signal_connect("destroy") {Gtk.main_quit }
Gtk.main


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