<!DOCTYPE html>
<html>
<head>
<style>
h1 {
font-size: 250%;
}
h2 {
font-size: 200%;
p {
font-size: 100%;
</style>
</head>
<body>
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<p>This is a paragraph.</p>
</body>
</html>