CSS text-transform property is used to change case of text. i.e. Lowercase, Uppercase and Capitalize.
<html>
<head>
<style type="text/css">
#p-uppr{
text-transform: uppercase;
}
#p-cptlze{
text-transform: capitalize;
}
#p-lwr{
text-transform: lowercase;
}
</style>
</head>
<body>
<p id="p-uppr">
hello world, how are you?
</p>
<p id="p-cptlze">
hello world, how are you?
</p>
<p id="p-lwr">
HELLO World, How ARE You?
</p>
</body>
</html>text-trasform:capitalize, makes the first letter of each word capital.