.bg{
    width: 10rem;
    height: 17.8rem;
    position: relative;
    margin: 0 auto;
}
.bg1{
    background: url(../images/bg1.png)no-repeat;
    background-size: 100% 100%
}
.bg2{
    background: url(../images/bg2.png)no-repeat;
    background-size: 100% 100%
}
.bg3{
    background: url(../images/bg3.png)no-repeat;
    background-size: 100% 100%
}
.top{
    width: 7.1rem;
    position: absolute;
    left: 1.45rem;
    top: 1rem;
}
.text{
    position: absolute;
    width: 3.62rem;
    left: 3.19rem;
    top: 16rem;
}
.down-btn{
    width: 6.8rem;
    height: 1.6rem;
    background: url(../images/downBtn.png) no-repeat;
    background-size: 100% 100%;
    position: absolute;
    left: 1.6rem;
    top: 2rem;
}
.bottom-bg{
    width: 10rem;
    height: 4.42rem;
    position: fixed;
    background: url(../images/bottom-bg.png)no-repeat;
    background-size: 100% 100%;
    bottom: 0;
    left: 50%;
    margin-left: -5rem;
    z-index: 500;

}