Hello, PageCSS is a tiny utility module that allows you to define CSS styles for an URL. In the Admin section, you will find a link called "PageCSS Configuration". Here, you will be able to view the custom styles you have defined for each URL. You can also add new styles to apply on aliased URLs, and edit or remove them. I will advise you to clear your cache once you add/modify items here.
The following dependencies have been removed from composer.json:
knplabs/github-api
php-http/guzzle6-adapter
michelf/php-markdown
drupal/apigee_edge
drupal/contact_emails
drupal/eu_cookie_compliance
drupal/google_tag
drupal/honeypot
drupal/metatag
drupal/node_view_permissions
drupal/pathauto
drupal/redirect
If you run composer update or any other command which would remove these dependencies from your composer.lock, please manually add the needed modules back to your project level composer.json.