old_contents: import React from 'react'
  import Document, { Head, Main, NextScript } from 'next/document'
  import stylesheet from '../styles/global.sass'
  
  export default class MyDocument extends Document {
    static getInitialProps ({ renderPage }) {
      const {html, head} = renderPage()
      return { html, head }
    }
  
    render () {
      return (
        <html>
          <Head>
            <link rel='shortcut icon' type='image/x-icon' href='/static/assets/favicon.ico' />
            <style dangerouslySetInnerHTML={{ __html: stylesheet }} />
            <title>Next Boilerplate</title>
          </Head>
          <body>
            {this.props.customValue}
            <Main />
            <NextScript />
          </body>
        </html>
      )
    }
  }
  
new_contents: import React from 'react'
  import Document, { Head, Main, NextScript } from 'next/document'
  import stylesheet from '../styles/global.sass'
  
  export default class MyDocument extends Document {
    static getInitialProps ({ renderPage }) {
      const {html, head} = renderPage()
      return { html, head }
    }
  
    render () {
      return (
        <html>
          <Head>
            <style dangerouslySetInnerHTML={{ __html: stylesheet }} />
            <link rel='shortcut icon' type='image/x-icon' href='/static/assets/favicon.ico' />
            <link href='https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css' rel='stylesheet' integrity='sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN' crossOrigin='anonymous' />
            <link href='https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css' rel='stylesheet' integrity='sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u' crossOrigin='anonymous' />
            <title>Next Boilerplate</title>
          </Head>
          <body>
            {this.props.customValue}
            <Main />
            <NextScript />
          </body>
        </html>
      )
    }
  }
  
subject: Add fontawesome and bootstrap css