In toc.html, change
<body>
to
<body bgcolor="color">
http://www.w3schools.com/tags/tag_body.asp
Removing the paragraph from toc.html would work.
To affect all future exports, make the same changes to
C:\Program Files (x86)\UltraRecall\Export\HTML\convert.xslt
You will need to run elevated (as administrator) in order to edit or copy this file to another path to edit and back after editing.
https://tinyurl.com/z7bb2gm