1:border 2:content+padding 3:background-image 4:background-color 5:margin
#wrap{ width:970px; top:0px;bottom:0px; margin:0 auto;}
#mainbody{ position:relative; margin-top:15px;}
#left{float:left;width:110px;}
#mid{float:left;margin-left:13px; width:650px;border:1px solid #999;}
#right{position:absolute;margin-left:790px; border:1px solid #999;}
#mainbody{ position:relative; margin-top:15px;}
#left{float:left;width:110px;}
#mid{float:left;margin-left:13px; width:650px;border:1px solid #999;}
#right{position:absolute;margin-left:790px; border:1px solid #999;}
2017-05-15