Center, add border and drop shadow

There's two sets of CSS here - one for print, and the other for web. Most of it is common, but there are a few differences.

We should be able to make this look more similar to a nice print preview.

Inspect the two CSS sets described in the issue, distinguishing the print styles from the web styles. Compare their rendering in a print preview and determine how centering, a border, and a drop shadow should make the web version more similar; done means the preview visibly reflects those changes.

Written by the indexing model from the issue text.