ProntoCSS is a simple css framework written in SCSS that contains a simple grid, components and helps (a lot) to prepare printing.
Since the grid is flex based, you can only use ProntoCSS if you target modern browsers.
yarn add prontocss
or
bower install prontocss
You can use the minified file in dist but we very much suggest that you import pronto.scss and override variables.
For more informations, please see https://benoitzohar.github.io/ProntoCSS/