[](https://bundlephobia.com/package/@theme-ui/css)
npm install @theme-ui/css
@theme-ui/css contains the framework-agnostic core logic of Theme UI. It lets
you write style objects with responsive, theme-aware ergonomic shortcuts.
``sh`
npm i @theme-ui/css @emotion/react
`js
import { css as transformStyleObject } from '@theme-ui/css'
import { css as createClassName } from '@emotion/css'
const root = document.getElementById('root')
/* @type {import("@theme-ui/css").Theme} /
const theme = {
colors: {
text: '#222',
},
fonts: {
mono: 'monospace',
},
space: {
sm: '1rem',
md: '2rem',
},
}
const styles = transformStyleObject({
padding: ['sm', 'md'],
border: ({ colors }) => 2px solid ${colors.text},
h1: {
fontFamily: 'mono',
color: 'text',
},
})(theme)
root.classList.add(createClassName(styles))
root.innerHTML =
@theme-ui/css in Vanilla JS!
``