padding和border默认是不算在width的里面
padding和border算在width的里面
*{ -webkit-box-sizing:border-box;
-moz-box-sizing:border-box;
-ms-box-sizing:border-box;
box-sizing:border-box;}
padding和border不算在width的里面
*{ -webkit-box-sizing:content-box;
-moz-box-sizing:content-box;
-ms-box-sizing:content-box;
box-sizing:content-box;}