.pc .banner{
    height: 900px;
    background: url(../images/ks_banner_bg.jpg) no-repeat center;
    position: relative;
}
.pc .banner img{
    position: absolute;
    top: 237px;
    left: 50%;
    margin-left: -490px;
    width: 978px;
    opacity: 0;
}
.ksa img,.ksb img{
    position: absolute;
    left: 0;
    right: 0;
    margin: 0 auto;
    opacity: 0;
}
.ksa{
    height: 922px;
    background: url(../images/ksa_bg.jpg) no-repeat center;
    position: relative;
}
.ksa img{
    top: 67px;
}
.ksb{
    height: 1520px;
    background: url(../images/ksb_bg.jpg) no-repeat center;
    position: relative;
}
.ksb img{
    top: 70px;
}
.ksc{
    height: 1959px;
    background: url(../images/ksc_bg.jpg) no-repeat center;
    overflow: hidden;
    text-align: center;
}
.ksc img{opacity: 0;}
.ksc img:nth-child(1){
    margin: 229px auto 138px;
}
.ksc img:nth-child(2){
    margin: 0 auto;
}
.ksc img:nth-child(3){
    margin: 235px auto;
}