Hi Juan
The online version is exactly what I wanted, from the start (just being able to inspect the selectors to write my overwriting styles).
I am, however still having an issue - I keep getting the Cors origins error "No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin '<domain-name>' is therefore not allowed access."
I then add a htaccess header to set it (on the Moodle site) to be "*" - maybe not secure but for now I just need it to start working. This then gives me the error that the 'Access-Control-Allow-Origin' header now have content of "*, *" which is not allowed and therefore it can't load.
Removing the line from the htaccess file immediately results in the first error. I guess it either have no header or it is doubled - both of which result in the files not being able to get loaded.
I am using the latest version of Chromium for this development.