To test this mini template, you must install sass first in foremost. To do this, you can click in the link below to go in official website of SASS preprocessor.
SASS Website -> https://sass-lang.com/install
After
the install is complete, cd
to the right directory and run one of these command:
sass sass/style.css css/style.css
to compile one time.
sass --watch sass/style.css:css/style.css
to compile and track every changes automatically
It's done !