To style one paragraph with an extra-large bottom margin of 40 pixels using #paragraph3{margin-bottom:40px;}.
<!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">
#paragraph3{
margin-bottom:40px;
}
</style>
</head>
<body>
<h2 class="double-space">This is a header
this is a test. this is a test.
this is a test. this is a test.
this is a test. this is a test.
this is a test. this is a test.
this is a test. this is a test.
this is a test. this is a test.
</h2>
<p id ="paragraph3">This is a text.</p>
<p>This is a text.</p>
</body>
</html>
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