A lightweight, progressive, high-IQ CSS framework.


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A simple CSS foundation with responsive typography and input styling, built with PostCSS.

View the documentation.

In the age of Flexbox, CSS grid, and other exciting layout features, there is less and less need for a bloated CSS framework. What we do need is a simple foundation on top of which to build our own styles. Enter HiQ.


Start using HiQ by using npm to install the package or use the Github repository to get the latest development version.

npm install hiq



Import the compiled minified version in your CSS:

@import 'node_modules/hiq/dist/hiq.min.css';


Import the source version and process your CSS using PostCSS. This will give you access to the utility mixins that HiQ provides. Note that source files use the .pcss file extension.

@import 'node_modules/hiq/pcss/hiq.pcss';

To take full advantage of the PostCSS features in HiQ, you will need to configure your postcss.config.js to include these plugins (already installed with HiQ):

module.exports = {
    plugins: [

For more information on using PostCSS, read the PostCSS documentation usage section.


HiQ is built with custom properties and is easy to theme according to your own brand. Refer to the custom property reference, grab the properties you want to change, and include them in your project.

These can be included anywhere, before or after HiQ!

@import 'node_modules/hiq/dist/hiq.min.css';

:root {
  --hiq-button-border-color: lightgray;
  --hiq-button-background-color: lightgray;
  --hiq-button-text-color: black;

If you want your custom property definitions to apply globally, you should define them on the root element using :root. Otherwise, you can scope them to whatever element you wish.

For example, if you are creating a button variant, you could define the custom properties on a specific class:

button.is-primary {
  --hiq-button-border-color: blue;
  --hiq-button-background-color: blue;
  --hiq-button-text-color: white;