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4.0.6 • Public • Published


📦 Ergonomic, responsive React layout and grid system. The original Box component™ since 2015

Build Status Downloads Version MIT License system-ui/theme

  • Primitive styled components for all your layout needs
  • Customize styles inline with the sx prop
  • Ergonomic responsive array-based values
  • Support for component variants
  • Styled System props
  • Themeable and compatible with the Theme Specification
  • Built with Styled System
  • Works with Theme UI
  • Built with Emotion, with support for Styled Components

Getting Started

npm i reflexbox
import React from 'react'
import { Flex, Box } from 'reflexbox'
export default props =>
  <Flex flexWrap='wrap'>
      width={[ 1, 1/2 ]}
      width={[ 1, 1/2 ]}

sx Prop

The Box and Flex components both accept a sx prop that works with no additional setup required. The sx prop is similar to Emotion's css prop, but allows you to use values derived from the theme object.

Reflexbox follows the Theme Specification, which means that any theme created for use with Theme UI, Styled System, or other similar libraries will work out-of-the-box. This allows you to share design constraints for typography, color, and layout throughout your application using a theming context.

    p: 4,
    color: 'primary',

Note: to opt-out of theme-based styles, use the css prop instead, which will not transform values.


Because Reflexbox follows the Theme Specification, all themes built for use with Styled System, Theme UI, or other related libraries are compatible with Reflexbox.

To add a theme to an application, import the ThemeProvider component from emotion-theming and pass a custom theme object in.

npm i emotion-theming
import React from 'react'
import { ThemeProvider } from 'emotion-theming'
import { Flex, Box } from 'reflexbox'
const theme = {
  breakpoints: [
    '40em', '52em', '64em',
  colors: {
    text: '#000',
    background: '#fff',
    primary: '#07c',
  space: [
    0, 4, 8, 16, 32, 64, 128, 256,
export default props =>
  <ThemeProvider theme={theme}>
        p: 4,
        bg: 'primary',

For use with Theme UI, use gatsby-plugin-theme-ui or import the Theme UI ThemeProvider instead.

import { ThemeProvider } from 'theme-ui'


Reflexbox components also accept a variant prop, which allows you to define commonly used styles, such as cards, badges, and CSS grid layouts, in your theme object for reuse.

Add a variants object to your theme and include any variants as style objects. These styles can reference other values in your theme such as colors, typographic styles, and more.

// example theme
export default {
  colors: {
    text: '#000',
    background: '#fff',
    primary: '#07c',
  radii: {
    default: 4,
  shadows: {
    card: '0 0 4px rgba(0, 0, 0, .125)',
  variants: {
    card: {
      p: 3,
      borderRadius: 'default',
      bg: 'white',
      boxShadow: 'card',
    badge: {
      color: 'white',
      bg: 'primary',
      p: 1,
      borderRadius: 'default',

To apply a variant to your component, pass the name to the variant prop.

<Box variant='card'>Card</Box>
<Box variant='badge'>Badge</Box>

Responsive Styles

Use array values to quickly and ergonomically add mobile-first responsive styles to specific properties. This works on all style props and the sx prop. See the Styled System docs for more.

// 100% width at the smallest viewport width
// 50% width at the next breakpoint
// 25% width at the next breakpoint
<Box width={[ '100%', '50%', '25%' ]} />

You can customize the widths used for each breakpoint by defining a theme.breakpoints array in your theme.

Styled System Props

Reflexbox conforms to the Theme Specification and includes many common Styled System props. The Box and Flex components accept the following props:

Space Props

Prop Theme Key
margin, m space
marginTop, mt space
marginRight, mr space
marginBottom, mb space
marginLeft, ml space
marginX, mx space
marginY, my space
padding, p space
paddingTop, pt space
paddingRight, pr space
paddingBottom, pb space
paddingLeft, pl space
paddingX, px space
paddingY, py space

Layout Props

Prop Theme Key
width sizes
height sizes
minWidth sizes
maxWidth sizes
minHeight sizes
maxHeight sizes

Typography Props

Prop Theme Key
fontFamily fonts
fontSize fontSizes
fontWeight fontWeights
lineHeight lineHeights
letterSpacing letterSpacings
fontStyle N/A
textAlign N/A

Color Props

Prop Theme Key
color colors
backgroundColor, bg colors
opacity N/A

Flexbox Props

Prop Theme Key
alignItems N/A
alignContent N/A
justifyItems N/A
justifyContent N/A
flexWrap N/A
flexDirection N/A
flex N/A
flexGrow N/A
flexShrink N/A
flexBasis N/A
justifySelf N/A
alignSelf N/A
order N/A

Styled Components

To use Reflexbox with Styled Components, import components from reflexbox/styled-components.

import { Flex, Box } from 'reflexbox/styled-components'


This library is the result of consolidating APIs and ergonomics from the original Reflexbox library, Grid Styled, and Rebass Grid. Reflexbox originally appeared with the original version of Rebass in 2015.

MIT License


npm i reflexbox

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