AngularJS version of ProgressButtonStyles. I've also made less and sass versions of it besides css.   Demo

An ink bleed transition effect, powered by CSS animations.  Demo  Download

A set of experimental modal window appearance effects with CSS transitions and animations.  Demo

A collection of dialog effects using CSS (and SVG) animations.  Demo

How to make a carousel using only HTML and CSS (no JavaScript required!)

A little slideshow with a color palette creation effect using CSS Filters and Vibrant.js .

A secondary content panel that folds flat, powered by CSS Transformations and jQuery.  Demo

 PostCSS is a tool for transforming CSS with JS plugins. These plugins can support variables and mixins, transpile future CSS syntax, inline images, and more.
PostCSS is used by Google, Twitter, Alibaba, and Shopify.
PostCSS itself is very small. It includes only a CSS parser, a CSS node tree API, a source map generator, and a node tree stringifier