Finally, we upgraded SASS to a new version of SASS, which brings tons of changes to your development. It started in SharePoint Framework version 1.15, and the transition is now completed in 1.16.1. While importing 3rd party CSS via ‘@import’ is still possible, this option will be lost at some point.
Let me explain what other options you have to import 3rd party CSS to your web parts or extension CSS.[Read more]