# Getting Started

# Installation

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

npm install hiq

# Usage

There are a few different ways you can include HiQ in your project.

# Basic

Import the compiled minified version in your CSS:

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

# Advanced

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 .css file extension.

@import '~hiq/css/hiq.css';

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: [

You may also want to include the following optional plugins (also installed with HiQ):


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

# Individual Files

Any of the HiQ CSS files can be imported independently. For example, if you want only the button styles, import the buttons file, after the basic utility files:

@import '~hiq/css/utility/*.css';
@import '~hiq/css/elements/buttons.css';

If you go with this approach, we recommend importing at least the base styles first and then including additional files after that. The base files will give you the typographic scale and basic structural styles. This is not required, however.

@import '~hiq/css/utility/*.css';
@import '~hiq/css/base/*.css';
@import '~hiq/css/typography/*.css';

@import '~hiq/css/base/buttons.css';

# Theming

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 '~hiq/dist/hiq.min.css';

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

Ideally, you would include your custom properties within a variables.css file.

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

/* your own custom property definitions */
@import 'variables.css';

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

To apply custom properties on specific elements or classes, you can define the local, scoped version of the custom properties (remove the hiq- prefix).

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

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

You can also redefine custom properties within media queries:

/* width-based media query */
@media (min-width: 800px) {
  --hiq-container-horizontal-gap: 3rem;

/* color scheme-based media query */
@media (prefers-color-scheme: dark) {
  --hiq-color-gray-1: hsl(220, 10%, 98%);

# Custom Property Fallback Chain

HiQ is designed in such a way that elements will use the most specific custom property that you have defined, and fallback to more generic properties, until finally falling back to a static value.

Take this button as an example:

button {
    /* use the scoped button background color variable, if defined */
      /* otherwise use the global background color variable, if defined */
        /* otherwise use the primary color variable, if defined */
          /* otherwise fallback to a static color value */
          hsl(210, 100%, 50%)

This way, you have the freedom to be as specific with your custom property definitions as you want, without actually being required to define any custom properties at all.

# Browser Support

The HiQ distribution build will work in any browsers that support custom properties. See the Can I Use page for the full browser listing.


Note that as of v3.0.0, HiQ does NOT work with any versions of Internet Explorer.

# Vendor Prefixes

The compiled version of HiQ comes with vendor prefixes included. If you want greater control over which prefixes are used, you can import the HiQ source files and run them through your own PostCSS setup.

We recommend using autoprefixer and defining the browsers you wish to support using browserslist.