PostCSS Size nib PostCSS plugin that allows the use of "size:" instead of width & height. .foo { size: 10px;}.bar { size: 5px 10px;} .foo { width: 10px; height: 10px;}.bar { width: 5px; height: 10px;} Usage postcss([ require('postcss-size-nib') ]) See PostCSS docs for examples for your environment.