Text-transform
<html>
<head>
<title>This is CSS Internal style</title>
<style type="text/css">
Upper{Text-transform: uppercase}
Lower{Text-transform: lowercase}
Proper{Text-transform: capitalize}
</style>
</head>
<body>
<p><Upper>Change Into Upper Case</Upper></p>
<p><Lower>Change Into Lower Case</Lower></p>
<p><Proper>capitalize the sentence</Proper></p>
</body>
</html>