lablgtk3
GObj.style_context
@gtkdoc gtk GtkStyleContext
val ctxt : Gtk.style_context
method as_style_context : Gtk.style_context
method add_provider : css_provider -> int -> unit
method remove_provider : css_provider -> unit
method add_class : string -> unit
method remove_class : string -> unit
method has_class : string -> bool
method list_classes : string list