css - How to syle a Gtk::ComboBox -

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How do I style a combo box, but unfortunately I try two months to find ways to not work I am ... the only thing I could do was to styling the contents of the combo box (cell renderer), but the combo box was not there, can you please help me?

gtk_style_context_add_class (gtk_widget_get_style_context (cockbox), "button or any style you want");


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