the state for which to set the background color
the color to assign, or NULL to undo the effect of previous calls to Widget.overrideBackgroundColor
Deprecated: 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 GtkStyleProvider and a CSS style class. You can also override the default drawing of a widget through the draw signal, and use Cairo to draw a specific color, regardless of the CSS style.