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"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
     
"Never increase, beyond what is necessary, the number of entities required to explain anything." William of Ockham (1285-1349)
           
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W3School.com.cn - The Largest Web Developers Site On The Net!
            
W3School.com.cn - The Largest Web Developers Site On The Net!
            
W3School.com.cn - The Largest Web Developers Site On The Net!
            
W3School.com.cn - The Largest Web Developers Site On The Net!
            
W3School.com.cn - The Largest Web Developers Site On The Net!
            
W3School.com.cn - The Largest Web Developers Site On The Net!
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回复讨论(解决方案)

@charset "utf-8";/* CSS Document */#header{ padding:0.5em;color:white;background-color:gray;clear:both;}#mainbox {     width:1250px;	margin:0 auto;	border:5px;		border:1px solid black;} #sidebar {        float:left;	padding:auto;	width:445px;	background:#F0F;	height:170%;			 }  #content {     FLOAT: left;	width:650px;		PADDING:auto;	background:#499;	height:170%;    }#footer{    padding:2.5em;color:white;background-color:gray;clear:both; text-align:center;}

[img=http://my.csdn.net/my/album/detail/1163464][/img]
如图，粉红色与绿色的行高对不齐，请问如何才能自动对齐呢？

[img=http://my.csdn.net/my/album/detail/1163464#][/img]

楼主参考下

http://www.blueidea.com/tech/web/2006/3210.asp

自己慢慢设置，设一个值调了看看、、不等在重新设

#sidebar { float:left; padding:auto; width:445px; background:#F0F; height:540px; overflow:hidden; }

#content { FLOAT: left; width:650px; PADDING:auto; background:#499; height:540px;overflow:hidden; }

改成这样试试一下，因为都是内部的DIV，不属于浮动层，DIV会随着数据的增加变高，很明显，你左右2部分的P标签不一样多，建议设置成固定值，然后overflow:hidden;这样垂直方向就不会被挤开。