code: def admin_tools_render_menu_css(context, menu=None):
      
      if menu is None:
          menu = get_admin_menu(context)
  
      context.update({
          'template': 'admin_tools/menu/css.html',
          'css_files': menu.Media.css,
      })
      return context
docs: Template tag that renders the menu css files,, it takes an optional
      ``Menu`` instance as unique argument, if not given, the menu will be
      retrieved with the ``get_admin_menu`` function.