code: def inline_image(image, mime_type=None, dst_color=None, src_color=None, spacing=None, collapse_x=None, collapse_y=None):
      
      return _image_url(image, False, False, dst_color, src_color, True, mime_type, spacing, collapse_x, collapse_y)
docs: Embeds the contents of a file directly inside your stylesheet, eliminating
      the need for another HTTP request. For small files such images or fonts,
      this can be a performance benefit at the cost of a larger generated CSS
      file.