Based on ITCSS :
Using the libraries :
To compile the css use :
npm run build
npm run compress
# or, using yarn,
yarn build
yarn compress
To watch the changes :
npm run concurrent
# or, using yarn,
yarn concurrent
To serve the demonstration pages, use :
npm run dev
# or, using yarn,
yarn dev
To build only the pages, use :
npm run build:pages
# or, using yarn,
yarn build:pages