missing <div> tag

[gwmatthews]

Hi! Thank you for making this available -- I'll be using it for a couple of book projects that I am turning into open source books for use in courses I teach.

The issue I found was a simple missing <div> tag in the preamble.html file. The LaTeX commands need to be wrapped in a <div style="display: none;"></div> set of tags otherwise they display on the top of the page. Your html of the published book has those tags but not the source code here.