Re: Unable to set background color for button

[Daniel Boles <dboles src gmail com>]

yes they do:

"""

Deprecated: 3.16: This function is not useful in the context of CSS-based rendering. If you wish to change the way a widget renders its background you should use a custom CSS style, through an application-specific Gtk::StyleProvider and a CSS style class. You can also override the default drawing of a widget through the Gtk::Widget::signal_draw()signal, and use Cairo to draw a specific color, regardless of the CSS style.

"""