html head style type text css main background-color ececec margin-top

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<html>
<head>
<style type="text/css">
#main {
background-color: #ececec;
margin-top: 2%;
margin-left: 15%;
margin-right: 15%;
padding: 2%;
width: 70%;
}
</style>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery.corner.js"></script>
<script type="text/javascript">
window.onload=function(){
$('#main').corner();
}
</script>
</head>
<body>
<div id="main">
testeng
</div>
</body>
</html>