Button.setRelief

Sets the relief style of the edges of the given #GtkButton widget. Two styles exist, [gtk.types.ReliefStyle.Normal] and [gtk.types.ReliefStyle.None]. The default style is, as one can guess, [gtk.types.ReliefStyle.Normal]. The deprecated value [gtk.types.ReliefStyle.Half] behaves the same as [gtk.types.ReliefStyle.Normal].