From the menu go to: Insert > CSS > Class Selector.
When a style sheet is created a method is needed to connect style statements to items in the document. The class selector matches the value of the HTML "CLASS" attribute. It is referenced by preceding the value with a period character ("."). NOTE: Do not included the period character (".") in the class tag!
Example:
<html>
<head>
<title> CSS Class Selector </title>
<style type="text/css">
<!--
.testfont { font-family: Arial, Verdana; font-size:12px; }
-->
</style>
</head>
<body bgcolor="#FFFFFF">
<table width="60%" border="0" cellspacing="0"
cellpadding="0" align="center">
<tr>
<td class=" testfontt">All content in this cell will reflect the
.testfont class.</td>
</tr>
</table>
</body>
</html>
