Place watermark to bottom position
        :param resource: Image.Image
        :return: Image.Image

def _bottom_position(self, resource):
        """
        Place watermark to bottom position
        :param resource: Image.Image
        :return: Image.Image
        """
        image = self._get_scaled_image(resource)

        left = int(round(resource.size[0] // 2 - image.size[0] // 2))
        upper = int(round(resource.size[1] - image.size[1]))

        return image, left, upper