code: def load_css(css_url=None, version='5.2.0'):
          
          css_filename = 'dropzone.min.css'
          serve_local = current_app.config['DROPZONE_SERVE_LOCAL']
  
          if serve_local:
              css = '<link rel="stylesheet" href="%s" type="text/css">\n' % \
                    url_for('dropzone.static', filename=css_filename)
          else:
              css = '<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/dropzone@%s/dist/min/%s"' \
                    ' type="text/css">\n' % (version, css_filename)
  
          if css_url:
              css = '<link rel="stylesheet" href="%s" type="text/css">\n' % css_url
          return Markup(css)
docs: Load Dropzone's css resources with given version.
  
          .. versionadded:: 1.4.4
  
          :param css_url: The CSS url for Dropzone.js.
          :param version: The version of Dropzone.js.