code: def admin_tools_render_dashboard_css(
          context, location='index', dashboard=None):
      
      if dashboard is None:
          dashboard = get_dashboard(context, location)
  
      context.update({
          'template': 'admin_tools/dashboard/css.html',
          'css_files': dashboard.Media.css,
      })
      return context
docs: Template tag that renders the dashboard css files, it takes two optional
      arguments:
  
      ``location``
          The location of the dashboard, it can be 'index' (for the admin index
          dashboard) or 'app_index' (for the app index dashboard), the default
          value is 'index'.
  
      ``dashboard``
          An instance of ``Dashboard``, if not given, the dashboard is retrieved
          with the ``get_index_dashboard`` or ``get_app_index_dashboard``
          functions, depending on the ``location`` argument.