Using Class to Specify Style

HTML Markup:

<HEAD>
<TITLE>Title</TITLE>
<STYLE TYPE="text/css">
H1.punk { color: #00FF00 }
</STYLE>
</HEAD>
<BODY>
<H1>Not green</H1>
<H1 CLASS=punk>Way too green</H1>
</BODY>

Final Display:

Not green

Way too green