특징
http://megaton111.cafe24.com/2017/01/11/sass-%EC%8B%9C%EC%9E%91%ED%95%98%EA%B8%B0/
https://soooprmx.com/archives/5059
https://velopert.com/1712
출력스타일
https://designmeme.github.io/ko/blog/sass-css-output-style/#fn:compact