<html>
<head>
<style type="text/css">
u.corner u
{
height: 1px;
font-size:1px;
display: block;
overflow: hidden;
/*author: meizz*/
text-decoration: none;
background-color: green;
}
u.corner u.h1{margin: 0 5px;}
u.corner u.h2{margin: 0 3px;}
u.corner u.h3{margin: 0 2px;}
u.corner u.h4{margin: 0 1px; height: 2px}
</style>
<head>
<body>
<div>
<u class="corner"><u class="h1"></u><u class="h2"></u><u class="h3"></u><u class="h4"></u></u>
<div style="background-color: green; height: 200">content</div>
<u class="corner"><u class="h4"></u><u class="h3"></u><u class="h2"></u><u class="h1"></u></u>
</div>
</body>
</html>
<head>
<style type="text/css">
u.corner u
{
height: 1px;
font-size:1px;
display: block;
overflow: hidden;
/*author: meizz*/
text-decoration: none;
background-color: green;
}
u.corner u.h1{margin: 0 5px;}
u.corner u.h2{margin: 0 3px;}
u.corner u.h3{margin: 0 2px;}
u.corner u.h4{margin: 0 1px; height: 2px}
</style>
<head>
<body>
<div>
<u class="corner"><u class="h1"></u><u class="h2"></u><u class="h3"></u><u class="h4"></u></u>
<div style="background-color: green; height: 200">content</div>
<u class="corner"><u class="h4"></u><u class="h3"></u><u class="h2"></u><u class="h1"></u></u>
</div>
</body>