Above these two rules, please add a comment explaining that they hide the main “done” button unless the Settings app replies to an activity. Thinking out loud: it would probably be clearer to put an id on the `<menu type="toolbar">` element containing the “done” button (e.g. id="activityDoneButton" or whatever) and use simple rules like:
```css
#activityDoneButton {
  display: none;
}

body[data-filter-by] #activityDoneButton {
  display: block;
}
```
(untested)