It is the control that causes the clash.  There is an xsl file named "word2html.xsl" within the WordXMLViewerControl project within the included solution.  Near the end of the xsl file are two "style" tags that are thrown into the generated html files; once they are removed, the origional css formatting will no longer be overwritten.  I had to remove the style sections and then rebuild the dll in visual studio.  I then followed the directions for adding it to my toolbox, readded the control to my webpage, and everything seemed to work fine.