# To Do

* Constraints
  * Thumbs: no zoom, no pan
  * Scroll: can't zoom out much, can't pan up and down
  * Book, Page: just the shown item
* Consistent height for all pages (rather than width)
* Make sure adjacent pages aren't visible
* Thumbs hover and active state (SVG overlay?)
* Resize on window resize
* When going to thumbs, scroll to the proper part of the page
* Show/hide pages?
* Support 400+ page collections