class selector example

HTML

<html>
<head>
<link type="text/css" href="style.css">
</head>
<body>
<p class="red">
This is a paragraph.
</p>
<p class="blue">
This is a paragraph.
</p>
<p class="blue">
This is a paragraph.
</p>
</body>
</html>

CSS

.red{color:red;}
.blue{color:blue;}
.green{color:red;}