css margin 使用厘米设置文本上边距

编辑代码

<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {margin-top:2cm;}
</style>
</head>

<body>

<p>A paragraph with no margins specified.</p>
<p class="ex1">A paragraph with a 2cm top margin.</p>
<p>A paragraph with no margins specified.</p>

</body>
</html>