*{
    margin: 0 ;
    padding: 0;
}
html,body{
    margin: 0;
    padding: 0;
}
.page-box{
    width: 100%;
    max-width: 550px;
    margin: 0 auto;
    background: no-repeat center;
    background-size: 100%;
}
.top-img{
    width: 100%;
    max-width: 550px;
    position: fixed;
    top: 0px;
    left: 50%;
    transform: translate(-50%, 0%);
}
.top-img img{
    width: 100%;
    display: block;
    margin: 0 auto;
}
.banner-box{
    width: 100%;
}
.banner-box img{
    width: 95%;
    margin: 0 auto;
    display: block;
}
.app-box{
    width: 100%;
}
.app-box img{
    width: 100%;
    display: block;
    margin: 0 auto;
}
.page-img{
    width: 100%;
}
.page-img img{
    width: 100%;
    display: block;
    margin: 0 auto;
}
.bottom-box{
    width: 100%;
    max-width: 550px;
    position: fixed;
    bottom: 0px;
    left: 50%;
    transform: translate(-50%, 0%);
    z-index: 999;
}
.bottom-img-box{
    width: 100%;
    position: relative;
}
.yx-img{
    width: 40%;
    position: absolute;
    top: -27%;
    left: 6%;
    z-index: 99;
}
.xz-img{
    width: 40%;
    position: absolute;
    top: -27%;
    right: 6%;
    z-index: 99;
}
.bottom-img-box .bg{
    width: 100%;
    display: block;
    margin: 0 auto;
}
@keyframes xing {
    0% {
        transform: scale(0.9);
    }
    25% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.9);
    }
    75% {
        transform: scale(1);
    }
    100% {
        transform: scale(0.9);
    }
}
.my_xing {
    -webkit-animation-name: xing;
    -webkit-animation-timing-function: ease-in-out;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-duration: 2s;
}