*{margin: 0;padding :0;font-size: 12px;color: #346667;font-family:Arial, Helvetica, sans-serif,"宋體";}a{text-align: none;}a:hover{text-decoration: underline;}h2{line-height: 30px;font-size:14px;}p{line-height: 24px;text-indent: 26px;}#wrap{width: 770px;margin: 0 auto;}#header{width: 762px;border:4px solid #badbdb;background:url(../images/banner.gif) no-repeat;height: 93px;color:#fff;text-align: center;}#header a{margin: 0 5px;color: #fff}#mainbody,#footer{width: 100%;}#footer{text-align: center;padding: 50px 0;}這個我把padding改成margin之后并沒有啥區別？？？求解