盒子的padding不影響總的大小css代碼

-moz-box-sizing: border-box; /*Firefox3.5+*/

-webkit-box-sizing: border-box; /*Safari3.2+*/

-o-box-sizing: border-box; /*Opera9.6*/

-ms-box-sizing: border-box; /*IE8*/

box-sizing: border-box; /*W3C标準*