.pc .banner{
    height: 900px;
    background: url(../images/dyyy_banner_bg.jpg) no-repeat center;
    position: relative;
}
.pc .banner img{
    position: absolute;
    top: 182px;
    left: 50%;
    margin-left: -595px;
    width: 424px;
    opacity: 0;
}