_output.yml

bookdown::gitbook: 
    includes:
      in_header: google_tag_header.html
      after_body: google_tag_body.html
    config:
      toc:
        collapse: section
        scroll_highlight: yes
        before: |
          <li><a href="./"><strong>Git & GitHub Tutorial</strong><br></a></li>
        after: |
          <li style="padding: 10px 15px; font-weight: bold;">Open access book-in-progress</li>
          <li><a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a></li>
          <li><a href="https://bookdown.org" target="_blank">Built with Bookdown</a></li>
      toolbar:
        position: static
      search: yes
      
bookdown::pdf_book: default