* Add a page background and give the three panels rounded white
  surfaces, so the app is not white on white
* Share colour, radius and shadow through variables in App.css
* Style the nav, filter and reset buttons consistently
* Put a track behind the stat bars so a low stat reads as a proportion
* Enlarge the sprite and sit it on a soft backdrop
* Tighten the list and favorites rows and match their styling
* Drop the global rules that centred all text and blocked selection
* Make the small screen list a compact sideways strip
* Keep the row layout in landscape, where stacking left the page far
  too tall, and shrink the sprite to bring the stats into view

References #11