def draw_background(self, surface, position, size):
pygame.draw.rect(surface, self.keyboard_background_color, position + size)<EOL>
Default drawing method for background.

        Background is drawn as a simple rectangle filled using this
        style background color attribute.

        :param surface: Surface background should be drawn in.
        :param position: Surface relative position the keyboard should be drawn at.
        :param size: Expected size of the drawn keyboard.