<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312" />
<title>无标题文档</title>
<style>
body{font-size:16px}
.li1{float:leftpadding-top:60px}
.li2{float:leftpadding-top:30pxmargin-left:-55px}
.li3{float:leftmargin-left:-55px}
</style>
</head>
<body>
<ol>
<li class="li1">CCCCCCC</li>
<li class="li2">BBBBBBB</li>
<li class="li3">AAAAAAA</li>
</ol>
</body>
</html>
你写的CSS样式没问题，是你太粗心了，这个里面多了一个空格<style type =" text/css">改成 <style type ="text/css">；这样就可以了
