The outermost HTML tag(s) of the HTML feed will have an id of "tagtooga". For example:

<div id="tagtooga">
<p id="title"><a href="URL1">TITLE1</a></p>
<p id="desc">DESCRIPTION1</p>
<p id="title"><a href="URL1">TITLE2</a></p>
<p id="desc">DESCRIPTION2</p>
...
</div>

This should be enough to add CSS rules for formatting the HTML feed. For example, this page uses the following CSS to make the feed pretty:

div#tagtooga p {

	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 8pt;
	color: #333333;
	
}

div#tagtooga a {
	color: #005FA9;
	text-decoration: none;
	font-size: 9pt;
	font-weight: bold;
	}
	
div#tagtooga a:hover {
	background-color: #ddeeff;
	}