From the menu go to: Insert > CSS > ID Selector.
When a style sheet is created a method is needed to connect style statements to items in the document. The 'id' selector matches the value of the HTML 'id' attribute. The id selector is defined as a #. NOTE: You can only use a specific 'id' once per document. Many browsers do not enforce this rule but it is a basic rule of HTML/XHTML and should be observed.
Example:
<html>
<head>
<title> CSS ID Selector </title>
<style type="text/css">
<!--
#specialfont { font-family: Arial, Verdana; font-size:12px; color:#00FF40;}
-->
</style>
</head>
<body bgcolor="#FFFFFF">
<table width="60%" border="0" cellspacing="0"
cellpadding="0" align="center">
<tr>
<td id="specialfont">All content in this cell will reflect the
#specialfont id.</td>
</tr>
</table>
</body>
</html>
