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A little bag of CSS superpowers, built on PostCSS.

Rucksack makes CSS development less painful, with the features and shortcuts it should have come with out of the box.

Read the full docs at



Rucksack is available on NPM under rucksack-css, install it with Yarn or NPM

$ yarn add rucksack-css --dev
$ npm i rucksack-css --save-dev


Rucksack can be used as a PostCSS plugin, direclty on the command line, and has helpers available for most build tools.


Use gulp-rucksack

const gulp = require('gulp');
const rucksack = require('gulp-rucksack');
gulp.task('rucksack', () => {
  return gulp.src('src/style.css')


Use grunt-rucksack

    rucksack: {
        compile: {
            files: {
                'style.css': 'src/style.css'
grunt.registerTask('default', ['rucksack']);


Use broccoli-rucksack

const rucksack = require('broccoli-rucksack');
tree = rucksack(tree, [options]);


Process CSS directly on the command line

$ rucksack src/style.css style.css [options]


Rucksack is built on PostCSS, and can be used as a PostCSS plugin

const postcss = require('postcss');
const rucksack = require('rucksack-css');
postcss([ rucksack() ])
  .process(css, { from: 'src/style.css', to: 'style.css' })
  .then(result => {
      fs.writeFileSync('style.css', result.css);
      if ( ) fs.writeFileSync('',;

See the PostCSS Docs for examples for your environment.


Rucksack can be used as a Stylus plugin with PostStylus


See the PostStylus Docs for more examples for your environment.


Responsive typography

Automagical fluid typography with new responsive arguments to font-size, line-height, and letter-spacing properties

.foo {
  font-size: responsive;

Responsive Type Demo

Shorthand positioning syntax

Use the shorthand syntax from margin and padding on position properties

.foo {
  position: absolute 0 20px;

Native clearfix

Generate bulletproof clearfixes with a new argument on the clear property

.foo {
  clear: fix;

Automatic font src generation

Automatically generate src sets for @font-face based on the path to your font files

@font-face {
  font-family: 'My Font';
  font-path: '/path/to/font/file';

Extra input pseudo-elements

Standardize the unweidly <input type="range"> element across browsers with new ::track and ::thumb pseudo elements

input[type="range"]::track {
  height: 2px;

Hex shortcuts for RGBA

Generate RGBA colors from a hex color + alpha value

.foo {
  color: rgba(#fff0.8);

More easing functions

Use a whole library of modern easing functions in transitions and animations

.foo {
  transition: all 250ms ease-out-cubic;

Quantity pseudo-selectors

Create truly responsive designs with powerful content quantity selectors

  color: blue;
  color: red;

CSS property aliases

@alias {
  fs: font-size;
  bg: background;
.foo {
  fs: 16px;
  bg: #fff;



Automatically apply vendor prefixes to relevant properties based on data from CanIUse, via autoprefixer.

Legacy Fallbacks

Automatically generate CSS fallbacks for legacy browsers, via laggard.


All features in Rucksack can be toggled by passing options on initialization. By default core features are set to true, and optional addons are set to false

Option Type Default Description
responsiveType Boolean true Whether to enable responsive typography
shorthandPosition Boolean true Whether to enable shorthand position properties
quantityQueries Boolean true Whether to enable quantity query psuedo selectors
alias Boolean true Whether to enable to enable property aliases
inputPseudo Boolean true Whether to enable whether to enable extra input pseudo elements
clearFix Boolean true Whether to enable native clear fix
fontPath Boolean true Whether to enable font src set generation
hexRGBA Boolean true Whether to enable hex RGBA shortcuts
easings Boolean true Whether to enable extra easing functions
fallbacks Boolean false Whether to enable CSS fallbacks addon
autoprefixer Boolean false Whether to enable autoprefixer addon
reporter Boolean false Whether to enable error reporting from plugins used inside Rucksack

MIT © Sean King