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为什么合起来3个id标签定义，宽度不能100%占满？_html/css_WEB-ITnose

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Release： 2016-06-24 12:04:52
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><style type="text/css">	div{		border:1px solid #039;		text-align:center;			}	#header{		width:100%;		height:80px;	}	.logo{		width:30%;		background-color:#0fc;		float:left;	}	.today{		width:30%;		background-color:#ccc;		float:left;	}	.search{		width:39.5%;/*定义为40%会导致搜索栏不能和前两个在同一行。*/		background-color:#cf9;		float:left;	}	</style></head><body>	<div id="header">    	<div class="logo">网站Logo</div>        <div class="today">当前日期</div>        <div class="search">搜索栏</div>    </div></body></html>
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回复讨论(解决方案)

你把所有div样式
div{
        border:1px solid #039;
        text-align:center;       
    }
加了边框，肯定不能按照100%来设置，你把边框去掉就可以了

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