.jiangpin span.item1{
   	background: url(../img/zyc1.png) no-repeat;
    -webkit-background-size: 100% auto;
    background-size: 100% auto;
    margin-top: 0;
}
.jiangpin span.item2{
   	background: url(../img/zyc2.png) no-repeat;
    -webkit-background-size: 100% auto;
    background-size: 100% auto;
}
.jiangpin span.item3{
   	background: url(../img/zyc3.png) no-repeat;
    -webkit-background-size: 100% auto;
    background-size: 100% auto;
}
.jiangpin span.item4{
   	background: url(../img/zyc4.png) no-repeat;
    -webkit-background-size: 100% auto;
    background-size: 100% auto;
}