It seems the new 1.3 NPM integration fails to include CSS files for the modules you install.
I have looked at 1.3 how to import css from npm package? and https://github.com/meteor/meteor/issues/6037 and a few more threads with more specific issues. There are a multitude of workarounds and suggested solutions in those threads, but I couldn’t find anything in the guide.
Is there not an officially recommended way to import NPM modules that contain CSS files?