Let's see that how we can use the class inside the css. Its really easy not a rocket science. IN Css we should have to start it in the head and then it will be started with the "." Dot and then we can write the name of the class let's see the example that how it works. For that

HTML Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
.center {
	
	text-align:center}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>
<p class="center">Welcome to new class</p>
<h1 class="center">Heading is center because of the Class</h1>
</body>
</html>
it shows that how it works. Now note that the class name should not be start with a number other wise it will not work other web browser then Internet explorer.

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<b>We also can specify that only specific HTML element like a p for paragraph tag </b>
Lets see an other example which will show that how CSS works with class
HTML Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
p.center {
	
	text-align:center}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Css class</title>
</head>

<body>
<p class="center">Welcome to new class</p>
<h1 class="center">Heading is center because of the Class</h1>
</body>
</html>
It will not show the result as we see in the previous example.