Add example for headers and link in the docs (#21821)
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@ -6,6 +6,13 @@ description: Add custom HTTP headers to your Next.js app.
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> This feature was introduced in [Next.js 9.5](https://nextjs.org/blog/next-9-5) and up. If you’re using older versions of Next.js, please upgrade before trying it out.
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<details open>
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<summary><b>Examples</b></summary>
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<ul>
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<li><a href="https://github.com/vercel/next.js/tree/canary/examples/headers">Headers</a></li>
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</ul>
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</details>
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Headers allow you to set custom HTTP headers for an incoming request path.
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To set custom HTTP headers you can use the `headers` key in `next.config.js`:
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34
examples/headers/.gitignore
vendored
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examples/headers/.gitignore
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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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/.pnp
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.pnp.js
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# testing
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/coverage
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# next.js
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/.next/
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/out/
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# production
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/build
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# misc
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.DS_Store
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*.pem
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# debug
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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# local env files
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.env.local
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.env.development.local
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.env.test.local
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.env.production.local
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# vercel
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.vercel
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23
examples/headers/README.md
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examples/headers/README.md
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# Headers Example
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This example shows how to use [headers in Next.js](https://nextjs.org/docs/api-reference/next.config.js/headers) to add custom HTTP headers into your Next.js app.
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The index page ([`pages/index.js`](pages/index.js)) has a list of links to pages with custom headers set up in [`next.config.js`](next.config.js). Run or deploy the app to see how it works!
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## Deploy your own
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Deploy the example using [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=next-example):
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[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/git/external?repository-url=https://github.com/vercel/next.js/tree/canary/examples/headers&project-name=headers&repository-name=headers)
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## How to use
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Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
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```bash
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npx create-next-app --example headers headers-app
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# or
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yarn create next-app --example headers headers-app
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```
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Deploy it to the cloud with [Vercel](https://vercel.com/new?utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).
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24
examples/headers/next.config.js
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24
examples/headers/next.config.js
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module.exports = {
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async headers() {
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return [
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{
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source: '/about',
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headers: [
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{
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key: 'X-About-Custom-Header',
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value: 'about_header_value',
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},
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],
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},
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{
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source: '/news/:id',
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headers: [
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{
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key: 'X-News-Custom-Header',
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value: 'news_header_value',
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},
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],
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},
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]
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},
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}
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15
examples/headers/package.json
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examples/headers/package.json
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{
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"name": "headers",
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"version": "1.0.0",
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"scripts": {
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"dev": "next dev",
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"build": "next build",
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"start": "next start"
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},
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"dependencies": {
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"next": "latest",
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"react": "^16.13.1",
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"react-dom": "^16.13.1"
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},
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"license": "MIT"
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}
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27
examples/headers/pages/about.js
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examples/headers/pages/about.js
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import Link from 'next/link'
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import styles from '../styles.module.css'
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const Code = (p) => <code className={styles.inlineCode} {...p} />
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export default function About() {
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return (
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<div className={styles.container}>
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<div className={styles.card}>
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<h1>Path: /about</h1>
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<hr className={styles.hr} />
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<p>
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The response contains a custom header{' '}
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<Code>X-About-Custom-Header</Code> : <Code>about_header_value</Code>.
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</p>
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<p>
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To check the response headers of this page, open the Network tab
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inside your browser inspector.
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</p>
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<Link href="/">
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<a> ← Back home</a>
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</Link>
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</div>
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</div>
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)
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}
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40
examples/headers/pages/index.js
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40
examples/headers/pages/index.js
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import styles from '../styles.module.css'
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const Code = (p) => <code className={styles.inlineCode} {...p} />
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const Index = () => (
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<div className={styles.container}>
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<div className={styles.card}>
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<h1>Headers with Next.js</h1>
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<hr className={styles.hr} />
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<p>
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The links below are examples of{' '}
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<a href="https://nextjs.org/docs/api-reference/next.config.js/headers">
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custom <Code>headers</Code>
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</a>{' '}
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added to your Next.js app.
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</p>
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<nav>
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<ul className={styles.list}>
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<li>
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<a href="/about">
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<a>Visit /about (it contains a X-About-Custom-Header)</a>
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</a>
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</li>
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<li>
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<a href="/news/123">
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<a>Visit /news/123 (it contains a X-News-Custom-Header)</a>
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</a>
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</li>
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</ul>
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</nav>
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<p>
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Open <Code>next.config.js</Code> to learn more about the headers that
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match the links above.
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</p>
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<hr className={styles.hr} />
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</div>
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</div>
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)
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export default Index
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31
examples/headers/pages/news/[...slug].js
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31
examples/headers/pages/news/[...slug].js
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import { useRouter } from 'next/router'
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import Link from 'next/link'
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import styles from '../../styles.module.css'
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const Code = (p) => <code className={styles.inlineCode} {...p} />
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const News = ({ props }) => {
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const { asPath } = useRouter()
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return (
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<div className={styles.container}>
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<div className={styles.card}>
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<h1>Path: {asPath}</h1>
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<hr className={styles.hr} />
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<p>
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The response contains a custom header{' '}
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<Code>X-News-Custom-Header</Code> : <Code>news_header_value</Code>.
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</p>
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<p>
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To check the response headers of this page, open the Network tab
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inside your browser inspector.
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</p>
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<Link href="/">
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<a> ← Back home</a>
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</Link>
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</div>
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</div>
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)
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}
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export default News
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51
examples/headers/styles.module.css
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51
examples/headers/styles.module.css
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.container {
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padding: 4rem 1rem;
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font-family: -apple-system, BlinkMacSystemFont, sans-serif;
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}
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.container p {
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margin: 1.5rem 0;
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}
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.card {
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max-width: 50rem;
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box-shadow: -10px 10px 80px rgba(0, 0, 0, 0.12);
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border: 1px solid #eee;
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border-radius: 8px;
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padding: 2rem;
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margin: 0 auto;
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}
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.inlineCode {
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color: #be00ff;
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font-size: 16px;
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white-space: pre-wrap;
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}
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.inlineCode::before,
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.inlineCode::after {
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content: '`';
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}
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.hr {
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border: 0;
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border-top: 1px solid #eaeaea;
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margin: 1.5rem 0;
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}
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.list {
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padding-left: 1.5rem;
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margin: 1.25rem 0;
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list-style-type: none;
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}
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.list li {
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margin-bottom: 0.75rem;
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}
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.list li:before {
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content: '-';
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color: #999999;
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position: absolute;
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margin-left: -1rem;
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}
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