#box{
    width: 100%;
    height: 100%;
}
.bg1{
    background-image: url('../img/bg1.png');
    background-size: 100%;
    width: 100%;
    height: 16.04rem;
}
.bg2{
    background-image: url('../img/bg2.png');
    background-size: 100%;
    height: 12.2rem;
    overflow: hidden;
}
.bg3{
    background-image: url('../img/bg3.png');
    background-size: 100%;
    height: 22.7066rem;
}
.bg4{
    background-image: url('../img/bg4.png');
    background-size: 100%;
    width: 100%;
    height: 35.16rem;
}
#box .btn_bottom{
    width: 100%;
    height: 1.8rem;
    position: fixed;
    left: 0;
    bottom: 0;
}
#box .btn_bottom p:first-child{
    width: 100%;
    height: 100%;
    background-color: #000;
    opacity: .6;
}
#box .btn_bottom p:last-child{
    position: fixed;
    z-index: 2;
    left: 13%;
    bottom: .233rem;
}
#box .btn_bottom p:last-child img{
    display: block;
    width: 7.4933rem;
    height: 1.24rem;
    margin: 0 auto;
}
#box .video{
    position: relative;
    width: 8.38rem;
    height: 9.48rem;
   margin-top: 1.83rem;
   margin-left: .8rem;
}
#box .video .video_iframe{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}