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這個不對,mainbody有問題

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>固定層</title>
<style type="text/css">
*{margin:0; padding:0; font-size:12px; list-style:none;}
a{text-decoration:none;}
a:hover{text-decoration:underline;}
a img{border:none;}
body{background:#efefec;}
#top{width:100%;
overflow:hidden;
border-bottom:1px solid #dadad9;
background:#fff;
float:left;
position:fixed;
text-align:center;}
#top input{border:none;}

.left{float:left; margin-left:10px;}
.search{float:left; margin-left:10px; margin-top:7px;}
.select_btn{background:url(images/select_top.gif) no-repeat; width:57px; height:42px; cursor:pointer; float:left;}
.search_input{background:url(images/input_search.gif) no-repeat; width:104px; height:28px; float:left; padding-left:5px;}
.search_btn{background:url(images/search_btn.gif) no-repeat; width:29px; height:28px; float:left;}

.right{float:right; margin-right:10px; padding:5px 10px 0; border-left:1px solid #f5f5f5; border-right:1px solid #f5f5f5; height:37px;}
.topbtn{background:url(images/top_btn.gif) no-repeat; width:54px; height:30px; line-height:30px; color:#444;}

.margin_l_10{margin-left:10px;}
.margin_t_5{margin-top:5px;}
.center{margin:0 15px;}
.center_r{margin-right:15px;}

#mainbody{width:80%;
overflow:hidden;
margin:0 auto;
padding-top:20px;}
.content{width:236px; border:1px solid #dcdcda; float:left;}
.content li{margin-bottom:15px; text-align:center;}
.content li h2{text-align:left; padding:12px 15px; font-weight:normal; color:#444; background:#fff; margin-top:-3px; background:#fafafa;}
.content li dl{border-top:1px solid #f2f2f2; text-align:left;}
.content li dt{padding:15px; float:left; border-right:1px solid #f2f2f2;}
.content li dd{padding-top:18px; text-indent:15px;}
.content li dd a{color:#9e7e6b;}

#footer{width:100%; background:#fff; text-align:center; padding:20px 0; color:#999; border-top:#ccc; margin-top:20px;}
</style>
</head>

<body>
<div id="top">
? <div class="left">
??? <div class="select_btn"></div>
??? <div class="search">
????? <input type="text" class="search_input" />
????? <input type="button" class="search_btn" />
??? </div>
? </div>
?
<div class="right">
??? <input type="button" value="登錄" class="topbtn" />
??? <input type="button" value="注冊" class="topbtn margin_l_10" />
? </div>
</div>
<div id="mainbody">
? <div class="content">
??? <ul>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="204" height="331" />
??????? <h2>人潮</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">霹靂紅唇</a> 采集到 <a href="#">時光</a></dd>
??????? </dl>
????? </li>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="303" />
??????? <h2>熊熊與蘑菇女</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">白雪公主</a> 采集到 <a href="#">漫漫畫語</a></dd>
??????? </dl>
????? </li>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="333" />
??????? <h2>幻化</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">流浪貓</a> 采集到 <a href="#">漫漫畫語</a></dd>
??????? </dl>
????? </li>
??? </ul>
? </div>
? <div class="content center">
?????? <ul>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="342" />
??????? <h2>桃花滿枝</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">白雪公主</a> 采集到 <a href="#">淡彩</a></dd>
??????? </dl>
????? </li>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="243" />
??????? <h2>小矮人</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">小p孩</a> 采集到 <a href="#">漫漫畫語</a></dd>
??????? </dl>
????? </li>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="330" />
??????? <h2>古代美女</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">小p孩</a> 采集到 <a href="#">傾國傾城</a></dd>
??????? </dl>
????? </li>
??? </ul>
? </div>
? <div class="content center_r">
?????? <ul>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="373" />
??????? <h2>阿貍愛</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">白雪公主</a> 采集到 <a href="#">愛漫</a></dd>
??????? </dl>
????? </li>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="333" />
??????? <h2>幻化</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">流浪貓</a> 采集到 <a href="#">漫漫畫語</a></dd>
??????? </dl>
????? </li>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="303" />
??????? <h2>熊熊與蘑菇女</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">白雪公主</a> 采集到 <a href="#">漫漫畫語</a></dd>
??????? </dl>
????? </li>
??? </ul>
? </div>
? <div class="content">
?????? <ul>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="330" />
??????? <h2>古代美女</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">小p孩</a> 采集到 <a href="#">傾國傾城</a></dd>
??????? </dl>
????? </li>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="236" height="416" />
??????? <h2>Queen&Princess</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">白雪公主</a> 采集到 <a href="#">漫漫畫語</a></dd>
??????? </dl>
????? </li>
????? <li><img src="http://img1.sycdn.imooc.com//565fea1e00017ecd03500472.png" width="204" height="331" />
??????? <h2>人潮</h2>
??????? <dl>
????????? <dt><img src="http://img1.sycdn.imooc.com//565fe994000179fe01510151.png" width="34" height="34" /></dt>
????????? <dd><a href="#">霹靂紅唇</a> 采集到 <a href="#">時光</a></dd>
??????? </dl>
????? </li>
??? </ul>
? </div>
</div>
<div id="footer">慕課@版權(quán)所有</div>
</body>
</html>

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