Set color scheme (foreground and background).

def set_color_scheme(self, foreground_color, background_color):
        """Set color scheme (foreground and background)."""
        if dark_color(foreground_color):
            self.default_foreground_color = 30
        else:
            self.default_foreground_color = 37

        if dark_color(background_color):
            self.default_background_color = 47
        else:
            self.default_background_color = 40