<!DOCTYPE HTML> <title>Fonts and margins of HTML headers</title> <style type="text/css"> div { border: medium solid blue } </style> <div><h1>Level 1</h1></div> <div><h2>Level 2</h2></div> <div><h3>Level 3</h3></div> <div><h4>Level 4</h4></div> <div><h5>Level 5</h5></div> <div><h6>Level 6</h6></div>