load = NULL,
    # toolbar = list(position = 'static'),
    toc = list(collapse = 'subsection')
)
```
]

.pull-right[
### .center[.fancy[Sample `_output.yml`]]
```js
bookdown::gitbook:
  css: [css/arm.css]
  highlight: kate
  config:
    toc: &lt;!--covered earlier!--&gt;
    download: ["rmd"]
    edit:
      link: https://github.com/USERNAME/REPO/edit/BRANCH/%s
      text: "Suggest an edit"
    sharing:
      github: yes
      facebook: no
      twitter: yes
```

Very important!
1. Edit link to read: &lt;b