EXAMPLE
Run 
<!DOCTYPE html>
<html>

<head>
	<title>The font-size property in CSS</title>
	<style type="text/css">
		h1{
			color: purple;
			font-size: x-small;
		}
		h2{
			color: red;
			font-size: large;
		}
	</style>
</head>

<body>
	<h1> Study Tonight </h1>
	<h2> Study Tonight </h2>
</body>

</html>