The nesting of newbie divs will not be arranged neatly_html/css

The nesting of newbie divs will not be arranged neatly_html/css_WEB-ITnose

WBOY

Release： 2016-06-24 12:17:29

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]#headertop{width:800px;height:20px;background:#CCFF77;}#headertop ul{list-style:none;}#headertop ul li{float:left;margin:10px auto 10px 0}#headerbottom{width:800px;height:80px;background:#CCFF44}#headerbottomleft{width:100px;height:80px;text-align:left;background:#CCFF55}#headerbottomcenter{width:400px;height:70px;background:#CCFF33}#headerbottomright{width:300px;height:70px;background:#CCFF66}<div id="header">    <!--页面头部-->	<div id="headertop">		<ul>			<li>亲，欢迎来淘宝！请</li>		</ul>	</div>	<div id="headerbottom">		<div id="headerbottomleft"></div>		<div id="headerbottomcenter"> </div>		<div id="headerbottomright"></div>	</div>  </div>

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[img=http://img.my.csdn.net/uploads/201212/09/1355025101_9227.jpg][/img This is how I wrote it, why is it not arranged neatly

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<html><head>    <style type="text/css">#header{width:798px;height:198px;border:1px solid blue; }#headertop{width:798px;height:48px;background:#CCFF77;border-bottom: dashed 1px;}#headertop ul{list-style:none;display: inline;}#headertop ul li{float: left;line-height: 48px;margin-left:40px; }#headerbottom{width:798;height: 148px;background: #CBFF43;}#headerbottomleft{width: 100;height: 80px;margin: 0 auto;border-left: dashed 1px;border-right: dashed 1px;}#headerbottomcenter{width: 384px;height:68px;margin:0 auto;border-top:dashed 1px;border-left:  dashed 1px;border-right: dashed 1px;} </style><body>    <div id="header">        <!--页面头部-->        <div id="headertop">            <ul>                <li>亲，欢迎来淘宝！请</li>            </ul>        </div>        <div id="headerbottom">            <div id="headerbottomleft"></div>            <div id="headerbottomcenter"> </div>            <div id="headerbottomright"></div>        </div>    </div></body>

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I am also a newbie, please include more mistakes. I have no use for the last headerbottomright because it doesn’t Know where to use it.

#headerbottom{width:800px;height:80px;background:#CCFF44;clear:both;}
#headerbottomleft{width:100px;height:80px;text-align:left; background:#CCFF55; float:left;}
#headerbottomcenter{width:400px;height:70px;background:#CCFF33; float:left;}
#headerbottomright{width:300px;height:70px;background: #CCFF66; float:right;}