border+"content+padding"+"background=image"+"background=color"+margin五层
*{margin:0; padding:0;}
#wrap{width:970px; margin:0 auto;}
#mainbody{position:relative; margin-top:15px;}
#left{float:left;width:110px; }
#mid{margin-left:123px; width:650px;border:1px solid #999;}
#right{position:absolute;left:780px;top:0px; width:230px; border:1px solid #999;}
#wrap{width:970px; margin:0 auto;}
#mainbody{position:relative; margin-top:15px;}
#left{float:left;width:110px; }
#mid{margin-left:123px; width:650px;border:1px solid #999;}
#right{position:absolute;left:780px;top:0px; width:230px; border:1px solid #999;}
2016-04-05