padding:0.25em; assigns one-quarter of the font size to padding (i.e., font-sizemultiplied by 0.25).
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
h2 {
font: bold italic 2em Georgia, Times, "Times New Roman", serif;
margin: 0;
padding:0.25em;
}
p {
margin: 0;
padding: 3em;
}
</style>
</head>
<body>
<h2>Designing Instant Gratification</h2>
<p>This is a test.</p>
</body>
</html>
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