Add custom styles and scripts to the backend.
You need to create the folder and files manually if they don’t exist already.
/workspace/backend-assets/custom.css
/workspace/backend-assets/custom.js
You can get variables from the Symphony Environment f. e. via Symphony.Context.get('env').page
This extension is based on Michael Eichelsdörfer's Admin CSS Override and is a actually a fork of an extension from Nils Hörmann.