Create a Tailwind CSS theme

In this guide, we’ll walk through the process of creating a custom Tailwind theme for your forms and inputs. Tailwind has risen to the forefront of CSS utility class libraries, and FormKit was authored with its capabilities in mind. Let’s get started!

SFC Build tool

This guide assumes you are using a standard Vue 3 build tool like Vite, Nuxt 3, or Vue CLI that will allow you to import .vue single file components.

Don't include the default theme

If you plan to use Tailwind CSS for your form styles then please ensure that your project is not importing the base genesis theme that ships with FormKit — otherwise you will get weird styling results.

Inline usage

In the context of a .vue file that represents a component, it's possible to create a Tailwind theme using the section-key class props or the classes prop provided by FormKit.

If your component represents your entire form and your project only requires a single form, this may be all that you need. Here is an example of applying the same Tailwind classes to a FormKit text input using both the section-key props and the classes prop:

Load Live Example

This is a low-barrier way to apply Tailwind styles to your FormKit forms, but what if you have multiple forms? Copy-pasting class lists between components is not ideal and will lead to inadvertent variations in styling across your project over time.

Let's explore how we can apply Tailwind classes globally to all FormKit inputs within our project.

Using @formkit/themes

FormKit ships a first-party package @formkit/themes that includes Tailwind CSS support — making it easy to create a Tailwind CSS theme for FormKit in your project.

The package enables you to author your theme as a JavaScript object grouped by input type and sectionKey. Additionally, you can access a number of Tailwind variants based on input and form state such as formkit-invalid: and formkit-disabled: which allow you to dynamically change your input styling.

To get started we need to add the package to our project.

npm install @formkit/themes

From there we need to do two things:

  • Add the formKitTailwind plugin from @formkit/themes to our project's tailwind.config.js file.
  • Import the generateClasses helper function from @formkit/themes and use it where we define our FormKit config options.
// tailwind.config.js
const formKitTailwind = require('@formkit/themes/tailwindcss');

module.exports {
  plugins: [
// app.js
import { createApp } from 'vue'
import App from './App.vue'
import { plugin, defaultConfig } from '@formkit/vue'
import { generateClasses } from '@formkit/themes'
import '../dist/index.css' // wherever your Tailwind styles exist

      config: {
        classes: generateClasses({
          // our theme will go here.
          // ...
          // text: {
          //   label: 'font-bold text-gray-300',
          //   ...
          // }
          // ...
Path needed if using formkit.config.js

If you are using a single file for configuration, like formkit.config.js within Nuxt, instead of app.js, you will need to add the path to that file to your tailwind.config.js inside the content property:

// tailwind.config.js for Nuxt users
const formKitTailwind = require('@formkit/themes/tailwindcss')

export default {
  // add the formkit.config.js file
  content: ['./src/**/*.{html,js}', './path/to/formkit.config.js'],
  plugins: [formKitTailwind],

Once this setup is complete we are ready to begin writing our Tailwind theme!

Our first Tailwind input

To start, let's apply some sensible classes to a text style input. This will cover a large surface area because we'll easily re-use these styles to other text-like inputs such as email, password, date, etc.

To specifically target text inputs we'll create a text key in our theme object and then apply classes to each sectionKey as needed.

Here is a text input with Tailwind classes applied:

Load Live Example

Using variants

The formKitTailwind plugin from @formkit/themes provides a number of variants you can use in your class lists to dynamically respond to input and form state.

Group variants

If you're using variants in a nested case, the variants may be linked to its parent instead of itself. To fix that, add to the outer section group/{modifier}, and use the variant with the same modifier formkit-invalid/{modifier}:

The currently provided variants are:

  • formkit-disabled:
  • formkit-invalid:
  • formkit-checked:
  • formkit-errors:
  • formkit-complete:
  • formkit-loading:
  • formkit-submitted:
  • formkit-multiple:
  • formkit-prefix-icon
  • formkit-suffix-icon

You use these variants in the same way you use the built-in Tailwind variants such as dark: and hover:.

Let's add some variants for formkit-invalid and formkit-disabled to our text input:

Load Live Example

A complete Tailwind theme — recreating Genesis CSS

Create a Tailwind CSS Theme - Vue School Course

11 mins

Now we're cooking! To create a comprehensive theme all we need to do is define class lists for the sectionKeys of all the other input types we'll use in our project.

There are some improvements we can make though. The generateClasses helper function from @formkit/themes allows for a special global key that will apply to all inputs. This is helpful for sectionKeys such as help and messages that are usually styled the same across all input types in a project.

Global and Family Class Lists

By using the global and family: keys in your theme object you can apply a class lists to all inputs that have a given sectionKey either globally or within a family of inputs. This is useful for things like labels or help text when you want to share styling across a wide variety of inputs.

Let's create a "Kitchen Sink" of input types, each having their defined class lists applied. Here is the theme in isolation for better readability:

// The following Tailwind theme aspires to be a reproduction of the
// default optional Genesis CSS theme that ships with FormKit

export default {
  // Global styles apply to _all_ inputs with matching section keys
  global: {
    fieldset: 'max-w-md border border-gray-400 rounded px-2 pb-1',
    help: 'text-xs text-gray-500',
    inner: 'formkit-disabled:bg-gray-200 formkit-disabled:cursor-not-allowed formkit-disabled:pointer-events-none',
    input: 'appearance-none bg-transparent focus:outline-none focus:ring-0 focus:shadow-none',
    label: 'block mb-1 font-bold text-sm',
    legend: 'font-bold text-sm',
    loaderIcon: 'inline-flex items-center w-4 text-gray-600 animate-spin',
    message: 'text-red-500 mb-1 text-xs',
    messages: 'list-none p-0 mt-1 mb-0',
    outer: 'mb-4 formkit-disabled:opacity-50',
    prefixIcon: 'w-10 flex self-stretch grow-0 shrink-0 rounded-tl rounded-bl border-r border-gray-400 bg-white bg-gradient-to-b from-transparent to-gray-200 [&>svg]:w-full [&>svg]:max-w-[1em] [&>svg]:max-h-[1em] [&>svg]:m-auto',
    suffixIcon: 'w-7 pr-3 flex self-stretch grow-0 shrink-0 [&>svg]:w-full [&>svg]:max-w-[1em] [&>svg]:max-h-[1em] [&>svg]:m-auto'

  // Family styles apply to all inputs that share a common family
  'family:box': {
    decorator: 'block relative h-5 w-5 mr-2 rounded bg-white bg-gradient-to-b from-transparent to-gray-200 ring-1 ring-gray-400 peer-checked:ring-blue-500 text-transparent peer-checked:text-blue-500',
    decoratorIcon: 'flex p-[3px] w-full h-full absolute top-1/2 left-1/2 -translate-y-1/2 -translate-x-1/2',
    help: 'mb-2 mt-1.5',
    input: 'absolute w-0 h-0 overflow-hidden opacity-0 pointer-events-none peer',
    inner: '$remove:formkit-disabled:bg-gray-200',
    label: '$reset text-sm text-gray-700 mt-1 select-none',
    wrapper: 'flex items-center mb-1',
  'family:button': {
    input: '$reset inline-flex items-center bg-blue-600 text-white text-sm font-normal py-3 px-6 rounded focus-visible:outline-2 focus-visible:outline-blue-600 focus-visible:outline-offset-2 formkit-disabled:bg-gray-400 formkit-loading:before:w-4 formkit-loading:before:h-4 formkit-loading:before:mr-2 formkit-loading:before:border formkit-loading:before:border-2 formkit-loading:before:border-r-transparent formkit-loading:before:rounded-3xl formkit-loading:before:border-white formkit-loading:before:animate-spin',
    wrapper: 'mb-1',
    prefixIcon: '$reset block w-4 -ml-2 mr-2 stretch',
    suffixIcon: '$reset block w-4 ml-2 stretch',
  'family:dropdown': {
    dropdownWrapper: 'my-2 w-full drop-shadow-lg rounded [&::-webkit-scrollbar]:hidden',
    emptyMessageInner: 'flex items-center justify-center text-sm p-2 text-center w-full text-gray-500 [&>span]:mr-3 [&>span]:ml-0',
    inner: 'max-w-md relative flex ring-1 ring-gray-400 focus-within:ring-blue-500 focus-within:ring-2 rounded mb-1 formkit-disabled:focus-within:ring-gray-400 formkit-disabled:focus-within:ring-1 [&>span:first-child]:focus-within:text-blue-500',
    input: 'w-full px-3 py-2',
    listbox: 'bg-white drop-shadow-lg rounded overflow-hidden',
    listboxButton: 'flex w-12 self-stretch justify-center mx-auto',
    listitem: 'pl-7 relative hover:bg-gray-300 data-[is-active="true"]:bg-gray-300 data-[is-active="true"]:aria-selected:bg-blue-600 aria-selected:bg-blue-600 aria-selected:text-white',
    loaderIcon: 'ml-auto',
    loadMoreInner: 'flex items-center justify-center text-sm p-2 text-center w-full text-blue-500 formkit-loading:text-gray-500 cursor-pointer [&>span]:mr-3 [&>span]:ml-0',
    option: 'p-2.5',
    optionLoading: 'text-gray-500',
    placeholder: 'p-2.5 text-gray-400',
    selector: 'flex w-full justify-between items-center [&u]',
    selectedIcon: 'block absolute top-1/2 left-2 w-3 -translate-y-1/2',
    selectIcon: 'flex box-content w-4 px-2 self-stretch grow-0 shrink-0',
  'family:text': {
    inner: 'flex items-center max-w-md ring-1 ring-gray-400 focus-within:ring-blue-500 focus-within:ring-2 [&>label:first-child]:focus-within:text-blue-500 rounded mb-1',
    input: 'w-full px-3 py-2 border-none text-base text-gray-700 placeholder-gray-400',
  'family:date': {
    inner: 'flex items-center max-w-md ring-1 ring-gray-400 focus-within:ring-blue-500 focus-within:ring-2 [&>label:first-child]:focus-within:text-blue-500 rounded mb-1',
    input: 'w-full px-3 py-2 border-none text-gray-700 placeholder-gray-400',

  // Specific styles apply only to a given input type
  color: {
    inner: 'flex max-w-[5.5em] w-full formkit-prefix-icon:max-w-[7.5em] formkit-suffix-icon:formkit-prefix-icon:max-w-[10em]',
    input: '$reset appearance-none w-full cursor-pointer border-none rounded p-0 m-0 bg-transparent [&::-webkit-color-swatch-wrapper]:p-0 [&::-webkit-color-swatch]:border-none',
    suffixIcon: 'min-w-[2.5em] pr-0 pl-0 m-auto'
  file: {
    fileItem: 'flex items-center text-gray-800 mb-1 last:mb-0',
    fileItemIcon: 'w-4 mr-2 shrink-0',
    fileList: 'shrink grow peer px-3 py-2 formkit-multiple:data-[has-multiple="true"]:mb-6',
    fileName: 'break-all grow text-ellipsis',
    fileRemove: 'relative z-[2] ml-auto text-[0px] hover:text-red-500 pl-2 peer-data-[has-multiple=true]:text-sm peer-data-[has-multiple=true]:text-blue-500 peer-data-[has-multiple=true]:ml-3 peer-data-[has-multiple=true]:mb-2 formkit-multiple:bottom-[0.15em] formkit-multiple:pl-0 formkit-multiple:ml-0 formkit-multiple:left-[1em] formkit-multiple:formkit-prefix-icon:left-[3.75em]',
    fileRemoveIcon: 'block text-base w-3 relative z-[2]',
    inner: 'relative max-w-md cursor-pointer formkit-multiple:[&>button]:absolute',
    input: 'cursor-pointer text-transparent absolute top-0 right-0 left-0 bottom-0 opacity-0 z-[2]',
    noFiles: 'flex w-full items-center px-3 py-2 text-gray-400',
    noFilesIcon: 'w-4 mr-2'
  radio: {
    decorator: 'rounded-full',
    decoratorIcon: 'w-5 p-[5px]'
  range: {
    inner: '$reset flex items-center max-w-md',
    input: '$reset w-full mb-1 h-2 p-0 rounded-full',
    prefixIcon: '$reset w-4 mr-1 flex self-stretch grow-0 shrink-0 [&>svg]:max-w-[1em] [&>svg]:max-h-[1em] [&>svg]:m-auto',
    suffixIcon: '$reset w-4 ml-1 flex self-stretch grow-0 shrink-0 [&>svg]:max-w-[1em] [&>svg]:max-h-[1em] [&>svg]:m-auto'
  select: {
    inner: 'flex relative max-w-md items-center rounded mb-1 ring-1 ring-gray-400 focus-within:ring-blue-500 focus-within:ring-2 [&>span:first-child]:focus-within:text-blue-500',
    input: 'w-full pl-3 pr-8 py-2 border-none text-base text-gray-700 placeholder-gray-400 formkit-multiple:p-0 data-[placeholder="true"]:text-gray-400 formkit-multiple:data-[placeholder="true"]:text-inherit',
    selectIcon: 'flex p-[3px] shrink-0 w-5 mr-2 -ml-[1.5em] h-full pointer-events-none',
    option: 'formkit-multiple:p-3 formkit-multiple:text-sm text-gray-700'
  textarea: {
    inner: 'flex max-w-md rounded mb-1 ring-1 ring-gray-400 focus-within:ring-blue-500 [&>label:first-child]:focus-within:text-blue-500',
    input: 'block w-full h-32 px-3 py-3 border-none text-base text-gray-700 placeholder-gray-400 focus:shadow-outline',

  // PRO input styles
  autocomplete: {
    closeIcon: 'block grow-0 shrink-0 w-3 mr-3.5',
    inner: '[&>div>[data-value]]:absolute [&>div>[data-value]]:mb-0',
    option: 'grow text-ellipsis',
    selection: 'static flex left-0 top-0 right-0 bottom-0 mt-0 mb-2 rounded bg-gray-100',
  datepicker: {
    inner: 'relative',
    panelWrapper: 'absolute top-[calc(100%_+_0.5em)] drop-shadow-[0_0_1.25em_rgba(0,0,0,.25)] rounded-md p-5 bg-white z-10',
    panelHeader: 'grid grid-cols-[2.5em_1fr_2.5em] justify-center items-center border-b-2 mb-4 pb-4',
    input: 'selection:bg-blue-400',
    monthsHeader: 'flex items-center justify-center col-start-2 col-end-2',
    timeHeader: 'flex items-center justify-center col-start-2 col-end-2',
    overlayPlaceholder: 'text-gray-400',
    months: 'flex flex-wrap',
    month: `
      flex items-center justify-center
      w-[calc(33%_-_1em)] m-2 p-2 rounded-md
      aria-selected:bg-blue-500 aria-selected:text-white
      focus:outline focus:outline-2 focus:outline-blue-500 focus:outline-offset-2 focus:bg-white focus:text-black
      formkit-disabled:opacity-50 formkit-disabled:cursor-default formkit-disabled:pointer-events-none
    yearsHeader: 'flex items-center justify-center col-start-2 col-end-2',
    years: 'flex flex-wrap max-w-[35em]',
    year: `
      flex items-center justify-center
      w-[calc(20%_-_1em)] m-2 p-2 rounded-md
      aria-selected:bg-blue-500 aria-selected:text-white
      focus:outline focus:outline-2 focus:outline-blue-500 focus:outline-offset-2 focus:bg-white focus:text-black
      formkit-disabled:opacity-50 formkit-disabled:cursor-default formkit-disabled:pointer-events-none
    weekDays: 'flex',
    weekDay: 'flex w-[2.25em] h-[1em] m-1 items-center justify-center rounded-md font-medium lowercase',
    week: 'flex formkit-disabled:opacity-50 formkit-disabled:cursor-default formkit-disabled:pointer-events-none',
    dayCell: `
      flex items-center justify-center
      w-[2.25em] h-[2.25em] m-1 p-2 rounded-md
      aria-selected:bg-blue-500 aria-selected:text-white
      focus:outline focus:outline-2 focus:outline-blue-500 focus:outline-offset-2 focus:bg-white focus:text-black
      formkit-disabled:opacity-50 formkit-disabled:cursor-default formkit-disabled:pointer-events-none
    timeInput: 'w-full border-2 border-gray-300 rounded-md p-2 my-[2em] focus-visible:outline-blue-500',
    daysHeader: 'flex items-center justify-center',
    prev: 'mr-auto px-3 py-1 hover:bg-gray-100 hover:rounded-lg col-start-1 col-end-1',
    prevLabel: 'hidden',
    prevIcon: 'flex w-3 select-none [&>svg]:w-full',
    dayButton: 'appearance-none cursor-pointer px-3 py-1 border-2 rounded-lg mx-1 hover:border-blue-500',
    monthButton: 'appearance-none cursor-pointer px-3 py-1 border-2 rounded-lg mx-1 hover:border-blue-500',
    yearButton: 'appearance-none cursor-pointer px-3 py-1 border-2 rounded-lg mx-1 hover:border-blue-500',
    next: 'ml-auto px-3 py-1 hover:bg-gray-100 hover:rounded col-start-3 col-end-3',
    nextLabel: 'hidden',
    nextIcon: 'flex w-3 select-none [&>svg]:w-full',
    openButton: `
      appearance-none border-0 bg-transparent flex p-0 self-stretch cursor-pointer
      focus-visible:outline-none focus-visible:text-white focus-visible:bg-blue-500
    calendarIcon: 'flex w-8 grow-0 shrink-0 self-stretch select-none [&>svg]:w-full [&>svg]:m-auto [&>svg]:max-h-[1em] [&>svg]:max-w-[1em]',
  rating: {
    inner: 'relative flex items-center w-[8em] formkit-disabled:bg-transparent',
    itemsWrapper: 'w-full',
    onItems: 'text-yellow-400',
    onItemWrapper: '[&>*]:w-full [&>svg]:h-auto [&>svg]:max-w-none [&>svg]:max-h-none',
    offItems: 'text-gray-500',
    offItemWrapper: '[&>*]:w-full [&>svg]:h-auto [&>svg]:max-w-none [&>svg]:max-h-none'
  repeater: {
    content: 'grow p-3 flex flex-col align-center',
    controlLabel: 'absolute opacity-0 pointer-events-none',
    controls: 'flex flex-col items-center justify-center bg-gray-100 p-3',
    downControl: 'hover:text-blue-500 disabled:hover:text-inherit disabled:opacity-25',
    fieldset: 'py-4 px-5',
    help: 'mb-2 mt-1.5',
    item: 'flex w-full mb-1 rounded border border-gray-200',
    moveDownIcon: 'block w-3 my-1',
    moveUpIcon: 'block w-3 my-1',
    removeControl: 'hover:text-blue-500 disabled:hover:text-inherit disabled:opacity-25',
    removeIcon: 'block w-5 my-1',
    upControl: 'hover:text-blue-500 disabled:hover:text-inherit disabled:opacity-25'
  slider: {
    outer: 'max-w-md',
    help: 'mt-0 mb-1',
    sliderInner: 'flex items-center py-1 [&>.formkit-max-value]:mb-0 [&>.formkit-max-value]:ml-8 [&>.formkit-max-value]:shrink [&>.formkit-max-value]:grow-0 [&>.formkit-icon]:bg-none [&>.formkit-icon]:border-none [&>.formkit-icon]:p-0 [&>.formkit-icon]:w-4 [&>.formkit-prefix-icon]:mr-2 [&>.formkit-suffix-icon]:ml-2 [&[data-has-mark-labels="true"]_.formkit-track]:mb-4',
    track: 'grow relative z-[3] py-1',
    trackWrapper: 'px-[2px] rounded-full bg-gray-200',
    trackInner: 'h-[6px] mx-[2px] relative',
    fill: 'h-full rounded-full absolute top-0 mx-[-4px] bg-blue-500',
    marks: 'absolute pointer-events-none left-0 right-0 top-0 bottom-0',
    mark: 'absolute top-1/2 w-[3px] h-[3px] rounded-full -translate-x-1/2 -translate-y-1/2 bg-gray-400 data-[active="true"]:bg-white',
    markLabel: 'absolute top-[calc(100%+0.5em)] left-1/2 text-gray-400 text-[0.66em] -translate-x-1/2',
    handles: 'm-0 p-0 list-none',
    handle: 'group w-4 h-4 rounded-full bg-white absolute top-1/2 left-0 z-[2] -translate-x-1/2 -translate-y-1/2 shadow-[inset_0_0_0_1px_rgba(0,0,0,0.1),0_1px_2px_0_rgba(0,0,0,0.8)] focus-visible:outline-0 focus-visible:ring-2 ring-blue-500 data-[is-target="true"]:z-[3]',
    tooltip: 'absolute bottom-full left-1/2 -translate-x-1/2 -translate-y-[4px] bg-blue-500 text-white py-1 px-2 text-xs leading-none whitespace-nowrap rounded-sm opacity-0 pointer-events-none transition-opacity after:content-[""] after:absolute after:top-full after:left-1/2 after:-translate-x-1/2 after:-translate-y-[1px] after:border-4 after:border-transparent after:border-t-blue-500 group-hover:opacity-100 group-focus-visible:opacity-100 group-data-[show-tooltip="true"]:opacity-100',
    linkedValues: 'flex items-start justify-between',
    minValue: 'grow max-w-[45%] mb-0 relative [&_.formkit-inner::after]:content-[""] [&_.formkit-inner::after]:absolute [&_.formkit-inner::after]:left-[105%] [&_.formkit-inner::after]:-translate-y-1/2 [&_.formkit-inner::after]:w-[10%] [&_.formkit-inner::after]:h-[1px] [&_.formkit-inner::after]:bg-gray-500',
    maxValue: 'grow max-w-[45%] mb-0 relative',
    chart: 'relative z-[2] mb-2 flex justify-between items-center w-full aspect-[3/1]',
    chartBar: 'absolute bottom-0 h-full bg-gray-400 opacity-[.66] data-[active="false"]:opacity-[.25]',
  taglist: {
    input: 'px-1 py-1 w-[0%] grow',
    removeSelection: 'w-2.5 mx-1 self-center text-black leading-none',
    tag: 'flex items-center my-1 p-1 bg-gray-200 text-xs rounded-full',
    tagWrapper: 'mr-1 focus:outline-none focus:text-white [&>div]:focus:bg-blue-500 [&>div>button]:focus:text-white',
    tagLabel: 'pl-2 pr-1',
    tags: 'flex items-center flex-wrap w-full py-1.5 px-2',
  toggle: {
    altLabel: 'block w-full mb-1 font-bold text-sm',
    inner: '$reset inline-block mr-2',
    input: 'peer absolute opacity-0 pointer-events-none',
    innerLabel: 'text-[10px] font-bold absolute left-full top-1/2 -translate-x-full -translate-y-1/2 px-1',
    thumb: 'relative left-0 aspect-square rounded-full transition-all w-5 bg-gray-100',
    track: 'p-0.5 min-w-[3em] relative rounded-full transition-all bg-gray-400 peer-checked:bg-blue-500 peer-checked:[&>div:last-child]:left-full peer-checked:[&>div:last-child]:-translate-x-full peer-checked:[&>div:first-child:not(:last-child)]:left-0 peer-checked:[&>div:first-child:not(:last-child)]:translate-x-0',
    valueLabel: 'font-bold text-sm',
    wrapper: 'flex flex-wrap items-center mb-1'
  transferlist: {
    outer: `
      [&_.dnd-placeholder]:bg-blue-500 [&_.dnd-placeholder]:text-white
      [&_.dnd-children-hidden]:w-full [&_.dnd-children-hidden]:p-0 [&_.dnd-children-hidden]:flex [&_.dnd-children-hidden]:flex-col [&_.dnd-children-hidden]:border-none
    fieldset: '$reset max-w-2xl',
    wrapper: 'flex max-h-[350px] flex-col sm:flex-row justify-between w-full max-w-none',
    help: 'pb-2',
    transferlist: 'sm:w-3/5 shadow-md flex flex-col min-h-[350px] max-h-[350px] border rounded overflow-hidden select-none bg-gray-50',
    transferlistHeader: 'flex bg-gray-100 justify-between items-center border-b p-3',
    transferlistHeaderItemCount: 'ml-auto text-sm',
    transferlistListItems: 'list-none bg-gray-50 h-full sm:max-w-xs overflow-x-hidden overflow-y-auto',
    transferlistListItem: 'pl-8 relative aria-selected:bg-blue-600 aria-selected:data-[is-active=true]:bg-blue-600 aria-selected:text-white aria-selected:data-[is-active=true]:text-white first:-mt-px first:border-t py-2 px-3 flex relative border-b bg-white data-[is-active=true]:text-blue-500 data-[is-active=true]:bg-gray-100 cursor-pointer group-data-[is-max=true]:cursor-not-allowed items-center',
    transferlistOption: 'text-sm',
    transferControls: 'flex sm:flex-col justify-center mx-auto my-2 sm:mx-2 sm:my-auto border rounded',
    transferlistButton: 'text-sm disabled:cursor-not-allowed disabled:bg-gray-200 disabled:opacity-50 first:rounded-l last:rounded-r sm:first:rounded-t sm:last:rounded-b appearance-none p-2 m-0 cursor-pointer h-10 border-none rounded-none bg-gray-50 hover:outline disabled:hover:outline-none hover:outline-1 hover:outline-black hover:text-blue-500 disabled:hover:text-current hover:z-10',
    sourceEmptyMessage: 'appearance-none border-none w-full p-0 m-0 text-center text-gray-500 italic',
    sourceListItems: 'group-data-[is-max=true]:opacity-50',
    targetEmptyMessage: 'appearance-none border-none w-full p-0 m-0 text-center text-gray-500 italic',
    emptyMessageInner: 'flex items-center justify-center p-2 text-sm',
    transferlistControls: 'bg-white px-3 py-2 border-b',
    transferlistSearch: 'flex border rounded items-center',
    transferlistSearchInput: 'border-none p-1 w-full bg-transparent outline-none text-sm',
    controlLabel: 'hidden',
    selectedIcon: 'w-3 absolute left-3 select-none',
    fastForwardIcon: 'w-10 flex select-none [&>svg]:m-auto [&>svg]:w-full [&>svg]:max-w-[1rem] [&>svg]:max-h-[1rem] rotate-90 sm:rotate-0',
    moveRightIcon: 'w-10 flex select-none [&>svg]:m-auto [&>svg]:w-full [&>svg]:max-w-[1rem] [&>svg]:max-h-[1rem] rotate-90 sm:rotate-0',
    moveLeftIcon: 'w-10 flex select-none [&>svg]:m-auto [&>svg]:w-full [&>svg]:max-w-[1rem] [&>svg]:max-h-[1rem] rotate-90 sm:rotate-0',
    rewindIcon: 'w-10 flex select-none [&>svg]:m-auto [&>svg]:w-full [&>svg]:max-w-[1rem] [&>svg]:max-h-[1rem] rotate-90 sm:rotate-0',

And here is our Tailwind theme when it is applied to all available FormKit inputs:

FormKit icons

FormKit inputs ship with their own decorator icons that can be used in place of browser-default styles that typcially ship with checkboxes, radios, select inputs, and more.

If you want to use these types of icons in your Tailwind theme be sure to import them from @formkit/icons and include them in your FormKit config.

Load Live Example

Selective overrides

And there we have it! All FormKit inputs styled with Tailwind utility classes across our entire project.

If we need to override any specific one-offs within our project, we can do so using the section-key class props or the classes prop on a given FormKit input within our project which was covered in the opening section of this guide.

Of particular importance when doing an override is the special $reset modifier for class lists. When the FormKit class system encounters a $reset class it will erase the current class list for the given section and only collect class names that occur after the $reset token was encountered. This is valuable in a system like Tailwind where it would be painful to have to write override classes or individually disable classes for every globally configured class when deviating from our theme:

Load Live Example

Next steps

This guide has walked through creating a Tailwind theme that covers all input types included in FormKit, but there's still more that could be done in your own project.

Here are some ways to take the above guide even further:

  • Add dark-mode support using Tailwind's built-in dark: modifier.
  • Combine multiple variants such as formkit-invalid:formkit-submitted: to add extra emphasis to invalid fields when a user tries to submit an incomplete form.
  • Publish your theme as an npm package for easy importing and sharing between projects.

Hopefully, this guide helped you understand how classes are applied to FormKit inputs and how you can leverage the formKitTailwind plugin from the @formkit/themes package to make use of Tailwind in your FormKit projects. If you want to dive in deeper, try reading about the core internals of FormKit and the FormKit schema!

Want more? Start by reading about FormKit core.Dig deeper