THOU SHALT HAVE NO GOD BEFORE @CHARSET
THOU SHALT HAVE NO GOD BEFORE @CHARSET

Per W3C:
https://www.w3.org/International/questions/qa-css-charset#atcharset
...charset declaration must be at the very beginning of the file, before
comments.

daveliepmann/tufte-css,d2m/tufte-css,edwardtufte/tufte-css