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Tailwind Utopia

Elegantly scale type and space without breakpoints
utopia.fyi

A Tailwind CSS v4 plugin that generates fluid font-size and spacing utilities:

<h1 class="text-fl-3xl px-fl-2xs-md">Example</h1>

• text-fl-3xl: sizes the text to 3xl
• px-fl-2xs-md: applies horizontal padding; 2xs for the smallest devices, interpolated up to md for the largest

Installation

npm install -D @mbelyayev/tailwind-utopia

Getting Started

Require the plugin in your tailwind.config.js file and reference it in the plugins section.

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      // ...
    }
  },
  plugins: [require('@mbelyayev/tailwind-utopia')]
}

With Tailwind CSS v4.0 and higher, you may use the @plugin directive to load the config file in your CSS file.

@config '../path/to/tailwind.config.js';

By default, this generates a fluid type scale and a fluid space scale with the same defaults as the Utopia calculators:

• A type scale with 2 negative steps and 5 positive steps from a 21px base size at the minimum screen size of 320px up to a 24px base size at the maximum screen size of 1140px, with the modular scale being 1.2 (minor third) at the minimum screen size and 1.25 (major third) at the maximum screen size.
• A spacing scale with t-shirt sizes from 3xs up to 3xl, and utilities for each space-value pair in the scale

Typographic Scale

The default font-size utility classes are as follows:

text-fl-xs
text-fl-sm
text-fl-base
text-fl-lg
text-fl-xl
text-fl-2xl
text-fl-3xl
text-fl-4xl

Spacing Scale

The default spacing utility classes are as follows:

<utility>-fl-3xs
<utility>-fl-2xs
<utility>-fl-xs
<utility>-fl-sm
<utility>-fl-md
<utility>-fl-lg
<utility>-fl-xl
<utility>-fl-2xl
<utility>-fl-3xl

These work with any utility classes that depend on the the spacing configuration, i.e. padding, margin, width, height, maxHeight, gap, inset, space, translate, scrollMargin, and scrollPadding.

Examples:

m-fl-lg
gap-fl-3xs
-space-x-fl-sm

Space Value Pairs

Utilities will be generated for any space value pairs. Separate t-shirt sizes with a -. Examples:

pt-fl-3xs-2xs // single step
m-fl-sm-lg // sm - lg step

Customization

The plugin is a standard Tailwind plugin, with its defaults set using a theme object. So all the defaults can be extended within your Tailwind config file:

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      utopia: {
        // customization
      }
    }
  }
}

Below is the default theme used by the plugin:

minWidth: 320,
minSize: 21,
minScale: 1.2,
maxWidth: 1140,
maxSize: 24,
maxScale: 1.25,
fontSize: {
  xs: 'inherit',
  sm: 'inherit',
  base: 1.4,
  lg: 1.33,
  xl: 1.2,
  '2xl': 1.11,
  '3xl': 1,
  '4xl': 1
},
spacing: {
  '3xs': 0.25,
  '2xs': 0.5,
  xs: 0.75,
  sm: 1,
  md: 1.5,
  lg: 2,
  xl: 3,
  '2xl': 4,
  '3xl': 6
}

• minWidth: the screen size the scale starts at in px (unitless integer)
• minSize: the base font size at the minScreen size (unitless integer)
• minScale: the modular scale to use for type sizes at minScreen size (decimal)
• minScreen: the screen size at which the scale stops increasing in px (unitless integer)
• maxSize: the base font size a the maxScreen size (unitless integer)
• maxScale: the modular scale to use at the maxScreen size (decimal)
• fontSize: the names, line-heights, and min/max text size configuration. The key determines the class name that will be generated. A non-object value will be used for the line-height. Alternatively, an object can configure the lineHeight and min/max values. For example:

  '4xl': {
    lineHeight: 0.88,
    min: 'var(--f-3xl-min)'
  }
  

  This overrides the 4xl size, bringing the min size down to that of 3xl. Unspecified values will use the defaults. Read Utopian CSS generator, an iteration for more on this approach.
• spacing: the names and multipliers for the spacing scale

You can reference other parts of your theme config if desired (e.g. for using entries from your screens config). An example customization could look as follows:

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      utopia: theme => ({
        minWidth: theme('screens.sm'),
        maxWidth: theme('screens.xl')
      })
    }
  }
}

Configuration

The plugin has the following options to configure the style of classes generated and how they are generated.

<table> <tr> <th>Option</th><th>Default</th> </tr> <tr> <td>prefix</td><td>'fl-'</td> <tr> <tr> <td>baseKey</td><td>'base'</td> <tr> </table>

Apply configuration when calling the plugin in the Tailwind config:

// tailwind.config.js
module.exports = {
  // …
  plugins: [
    require('@mbelyayev/tailwind-utopia')({
      prefix: 'f-'
    })
  ]
}

prefix

The string that prefixes the utility class's value.

baseKey

Internally, the plugin needs to know which steps in your scale are negative and which are positive. This is done by identifying the base step in your scale. Any entries in the sizes array before the base are considered negative, all those after are positive.

License

Distributed under the MIT License. See LICENSE for more information.

Acknowledgements

Dom Christie for taking the original repo forward with his fork.

Utopia: James Gilyead & Trys Mudford
Original Tailwind Utopia plugin: Chris Pymm & CWS Digital