Sets the background color for a widget in a particular state.
All other style values are left untouched. See also
gtk_widget_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. GtkLabel. 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 GtkEventBox widget
and setting the background color on that.
Sets the background color for a widget in a particular state. All other style values are left untouched. See also gtk_widget_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. GtkLabel. 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 GtkEventBox widget and setting the background color on that.