PostCSS
A tool for transforming CSS with JavaScript
Increase code readability
Add vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.
:fullscreen {
}
:-webkit-:full-screen {
}
:-moz-:full-screen {
}
:full-screen {
}
Use tomorrow’s CSS today!
PostCSS Preset Env lets you convert modern CSS into something most browsers can understand, determining the polyfills you need based on your targeted browsers or runtime environments, using cssdb.
@custom-media --med (width <= 50rem);
@media (--med) {
a {
&:hover {
color: color-mod(black alpha(54%));
}
}
}
@media (max-width: 50rem) {
a:hover {
color: rgba(0, 0, 0, 0.54);
}
}
The end of global CSS
CSS Modules means you never need to worry about your names being too generic, just use whatever makes the most sense.
.name {
color: gray;
}
.Logo__name__SVK0g {
color: gray;
}
Avoid errors in your CSS
Enforce consistent conventions and avoid errors in your stylesheets with stylelint, a modern CSS linter. It supports the latest CSS syntax, as well as CSS-like syntaxes, such as SCSS.
a {
color: #d3;
}
app.css
2:10 Invalid hex color
Powerful grid system
LostGrid makes use of calc() to create stunning grids based on fractions you define without having to pass a lot of options.
div {
lost-column: 1/3
}
div {
width: calc(99.9% * 1/3 -
(30px - 30px * 1/3));
}
div:nth-child(1n) {
float: left;
margin-right: 30px;
clear: none;
}
div:last-child {
margin-right: 0;
}
div:nth-child(3n) {
margin-right: 0;
float: right;
}
div:nth-child(3n + 1) {
clear: both;
}
Trusted by industry leaders
Is your company using PostCSS? Let us know!
Built by community for community
PostCSS is developed and maintained by hundreds of open source contributors. Become part of the family — submit your first Pull Request!

Formed in 2009, the Archive Team (not to be confused with the archive.org Archive-It Team) is a rogue archivist collective dedicated to saving copies of rapidly dying or deleted websites for the sake of history and digital heritage. The group is 100% composed of volunteers and interested parties, and has expanded into a large amount of related projects for saving online and digital history.
