banner大图全屏

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<html>
<head>
    <title>Title</title>
    <style>
        .bannerbox {
            width:100%;
            position:relative;
            overflow:hidden;
            height:200px;
        }
        .banner {
            width:3000px;
            position:absolute;
            left:50%;
            margin-left:-1500px;
        }
    </style>
</head>
<body>
    <div class="bannerbox">
        <div class="banner">
            <img src="t1.jpg">
        </div>
    </div> 
</body>
</html>