extra_css_js-8.x-1.1/extra_css_js.routing.yml

extra_css_js.admin_settings:
  path: '/admin/config/content/extra-css-js'
  defaults:
    _form: '\Drupal\extra_css_js\Form\SettingsForm'
    _title: 'Extra CSS JS settings'
  requirements:
    _permission: 'administer extra css js'