新手div的嵌套不会排列整齐_html/css_WEB-ITnose

]#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}
    	
		
			
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#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;}