So in bootstrap3 we had the \'Customize and download\' option, which we could download only whatever we needed. Now that bootstrap 4 supports flexbox, I only wanna download
if you just want to use flex-grid. I recommend
https://www.flexible-grid.com
https://github.com/kenangundogan/flexible-grid
flexible-grid/
├── scss
├── flexible-grid.scss
├── _variables.scss
├── _definitions.scss
├── _wrapper.scss
├── _array-list.scss
├── _attribute.scss
├── _grid.scss
└── _normalize.scss