This document uses the HTML/CSS infrastructure found at https://github.com/cplusplus/html-doc-framework.
Follow those instructions to get the most recent version of that presentation framework. This document may use elements and styles not found in the main distribution. A fork of that repository at https://github.com/asutton/html-doc-framework.
I believe that you can install this version using bower, by running this command instead of the one found on the previous page's instructions.
bower install asutton/html-doc-framework