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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
<style>
    p.ex1 {margin-top:2cm;}
</style>
</head>
<body>
    <p>没有规定页边距的段落.</p>
    <p class="ex1">顶部距2厘米的段落.</p>
    <p>没有规定页边距的段落.</p>
</body>
</html>
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