PostCSS based web application skinning strategy. This is a PostCSS plugin that will append new CSS properties to existing CSS rules. New CSS properties are loaded from a theme. See cgui for CLI.
All this library does is match selectors, extract rules from a template, and inject them into the CSS being processed.
Imagine that you really love round buttons. You create a "my-perfect-button.css" stylesheet, and now all you have to do is say: Hey! new-thing-i-found.css has ugly buttons, let's revolutionize all those buttons by stating .btn is a button therefore get all button properties from "my-perfect-button.css" and append them into new-thing-i-found.css's .btn rules.