<html>
<head>
<style type="text/css">
p.normal {font-weight: normal}
p.thick {font-weight: bold}
p.thicker {font-weight: 900}
</style>
</head>
<body>
<p class="normal">This is a paragraph</p>
<p class="thick">This is a paragraph</p>
<p class="thicker">This is a paragraph</p>
</body>
</html>