.pc .banner{
    height: 1010px;
    background: url(../images/tb_banner_bg.jpg) no-repeat center;
    position: relative;
}
.pc .banner img{
    position: absolute;
    top: 182px;
    left: 50%;
    margin-left: -713px;
    width: 1426px;
    opacity: 0;
}

.tba img,.tbb img{
    position: absolute;
    left: 0;
    right: 0;
    margin: 0 auto;
    opacity: 0;
}
.tba{
    height: 1398px;
    background: url(../images/tba_bg.jpg) no-repeat center;
    position: relative;
}
.tba img{
    top: 74px;
}
.tbb{
    height: 854px;
    background: #fff;
    position: relative;
}
.tbb img{
    top: 83px;
}