public void modify_bg (StateType state, Color? color)
Warning: modify_bg is deprecated since 3.0. Use override_background_color.
Sets the background color for a widget in a particular state.
Use override_background_color instead
All other style values are left untouched. See also modify_style.
Note that “no window” widgets (which have the gtk_no_window flag set) draw on their parent container’s window and thus may not draw any background themselves. This is the case for e.g. Label.
To modify the background of such widgets, you have to set the background color on their parent; if you want to set the background of a rectangular area around a label, try placing the label in a EventBox widget and setting the background color on that.
the state for which to set the background color
the color to assign (does not need to be allocated), or null to undo the effect of previous calls to of modify_bg.