Testing GTK and CSS with C++

main.cpp

/* Compile with
 * g++ -o program main.cpp `pkg-config --cflags --libs gtkmm-3.0`
 *
 * Original source: http://www.taringa.net/posts/linux/18386145/Gtkmm-3-12-c-subclass-o-class-dependiente.html
 */

#include <iostream>
#include <gtkmm-3.0/gtkmm.h>

#include <gdkmm/general.h>
#include <gtkmm/widget.h>
#include <gtkmm/cssprovider.h>

#include <cstring>

class MyLabel : public Gtk::Button{
	public :
		MyLabel(){
			set_border_width(10);
			add_label("tu");
		}
};

int main (int argc, char *argv[]){
	Gtk::Main kit(argc, argv);
	Gtk::Window window;

	Gtk::Box *vbox = new Gtk::Box(Gtk::ORIENTATION_VERTICAL, 0);
	
	window.add(*vbox);

	Gtk::Button button;
	button.add_label("Question");

	vbox->pack_start(button, Gtk::PACK_SHRINK, 0);
	
	Gtk::Label label("Hola");
	vbox->pack_start(label, Gtk::PACK_SHRINK, 0);
	Gtk::Entry entry;
	
	vbox->pack_start(entry, Gtk::PACK_SHRINK, 0);
	
	MyLabel mylabel;
	
	vbox->pack_start(mylabel, Gtk::PACK_EXPAND_WIDGET, 0);
	
	/**********/
	
	//load css
	Glib::RefPtr<Gtk::CssProvider> cssProvider = Gtk::CssProvider::create();
	cssProvider->load_from_path("style.css");
	
	Glib::RefPtr<Gtk::StyleContext> styleContext = Gtk::StyleContext::create();
	
	//get default screen
	Glib::RefPtr<Gdk::Screen> screen = Gdk::Screen::get_default();
	
	//add provider for screen in all application
	styleContext->add_provider_for_screen(screen, cssProvider, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
	
	window.show_all();
	Gtk::Main::run(window);
	
	return EXIT_SUCCESS;
}

style.css

MyLabel {
	border-radius: 30px;
	border-color: shade(#CCCCCC, 0.95);
}

.button {
	color: #C71EFF;
	-GtkWidget-focus-padding: 1;
	-GtkWidget-focus-line-width: 0;
}