Written in Sass, you can configure class names, provides 4 hard breakpoints, access to justify-content and align-items.
https://richardschwabe.github.io/basic-flex-box-grid/
npm i basic-flex-box-grid
yarn basic-flex-box-grid
The grid is based on the various other CSS frameworks. Without all the styling extras of a framework. It only focuses on a grid system, based on flexbox.