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margin-top沒有效果，border-bottom消失，

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????<title>無標(biāo)題文檔</title>
??</head>
??<style>
??????*{padding:0px;margin:0px;list-style:none;font-size:14px;}
??????.all{width:1000px;margin:0?auto;background-color:white;}
??????.logo{width:1000px;height:70px;}
??????.logo_left,.logo_rigjt{float:left;}
??????.logo_right?li{float:left;width:80px;line-height:70px;text-align:center;margin:0?5px;}
??????.logo_right?li?a{display:block;text-decoration:none;font-family:"微軟雅黑";color:black;font-weight:bold;}
??????.logo_right?li?a:hover{background-color:#B22222;padding:0px?6px;}
??????#ad{width:1000px;height:310px;}
??????.line{width:1000px;margin-top:25px;height:50px;}
??????.line_left,.line_right{float:left;}
??????.line_left{width:145px;background-color:#B22222;text-align:center;padding:10px?0;color:white;}
??????.line_right{width:845px;background-color:#444444;padding:10px?0;color:white;padding-left:10px;}
??????.mid{width:1000px;}
??????.mid?li{float:left;margin-right:3px;}
??????.mid?li?p{text-align:center;border:1px?solid?#E8E8E8;height:25px;line-height:25px;}
??????.content{width:1000px;height:250px;padding-top:15px;overflow:hidden;}
??????.content_left,.content_mid,.content_right{float:left;width:328px;height:250px;border:1px?solid?#E8E8E8;}
??????.content_left,.content_mid{margin-right:3px;}
??????.content?.boxup{width:width:328px;background-color:#B22222;height:30px;
??????line-height:30px;padding-left:10px;color:white;}
??????.content?.date{width:30px;height:40px;float:left;background-color:#B22222;margin:4px?8px;font-size:13px;text-align:center;padding-top:5px;color:white;}
?????.content_left?.boxdown?.pp{margin:4px?4px;line-height:20px;}
?????.content_left?.boxdown?.pp?p,h3{font-size:12px;}
?????.content_mid?.boxdown{line-height:30px;margin:10px?10px;}
?????.content_right?.boxdown{line-height:20px;margin:10px?10px;font-size:10px;}
?????.bottom{width:1000px;text-align:center;height:35px;background-color:#DDDDDD;line-height:35px;font-weight:bold;font-size:12px;margin-top:10px;}
??</style>
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??????????????<li><img?src="http://img1.sycdn.imooc.com//53edad54000119fb03300130.jpg"><p>玩轉(zhuǎn)bootstrap</p></li>
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??????????<div?class="boxup">新聞中心</div>
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?????????????????<div?class="date">8月23日</div>
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?????????????????<h3>學(xué)習(xí)計(jì)劃之"Android攻城獅初養(yǎng)成"</h3>
????????????????<p>想成為Android攻城獅?想開發(fā)一款專屬App?沒有任何基礎(chǔ)的你?????,應(yīng)該從何學(xué)起?</p>?
????????????????</div><hr>
????????????????
?????????????????<div?class="date">8月23日</div>
?????????????????<div?class="pp">
?????????????????<h3>學(xué)習(xí)計(jì)劃之"Android攻城獅初養(yǎng)成"</h3>
????????????????<p>想成為Android攻城獅?想開發(fā)一款專屬App?沒有任何基礎(chǔ)的你?????,應(yīng)該從何學(xué)起?</p>?
?????????????????</div><hr>
???????????????
??????????????
?????????????????<div?class="date">8月23日</div>
?????????????????<div?class="pp">
?????????????????<h3>學(xué)習(xí)計(jì)劃之"Android攻城獅初養(yǎng)成"</h3>
????????????????<p>想成為Android攻城獅?想開發(fā)一款專屬App?沒有任何基礎(chǔ)的你?????,應(yīng)該從何學(xué)起?</p>?
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			????????聯(lián)系我們<br?/>
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