I still don't have a strong opinion, but as is the file doesn't seem very useful. I tend to agree with @codebrainz, mostly because in 2019 it's likely user CSS will add rules on top of a framework, and if it's not it's likely be to either highly complex or very simple.
If we suppose very simple is a thing for CSS, maybe just having kind of an example file with `h1`, setting the `a` color, and setting a global font or so makes sense, but it'll likely be more of a "look at how CSS looks" than a really useful template.