body,
html {
    width: 100%;
    height: 100%
}

@media screen and (max-width: 768px) {
  .kefu {
    width: 70px;
  }

  .bottom-box {
    width: 100%;
  }
}

body {
    margin: 0;
    padding: 0;
    color: #000;
    background: #fff;
    font-size: 16px;
    font-family: 微软雅黑, PingFangSC-Regular, Helvetica Neue, Helvetica, Arial, sans-serif
}

a {
    text-decoration: none
}

img[src=""] {
    opacity: 0
}

img {
    pointer-events: none;
    border: none;
    vertical-align: middle
}
.page-box{
    width: 100%;
    max-width: 550px;
    margin: 0 auto;
    background: no-repeat center;
    background-size: 100% 100%;
}
.page-img{
    width: 100%;
}
.page-img img{
    width: 100%;
    display: block;
    margin: 0 auto;
}
.bottom-box {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0 auto;
    max-width: 550px;
    z-index: 99;
}
.bottom-box img{
    width: 100%;
    display: block;
    margin: 0 auto;
}
.kefu{
    width: 100px;
    position: fixed;
    right: 0px;
    top: 40%;
    z-index: 99;
}
.kefu img{
    width: 100%;
    display: block;
}
@keyframes xing {
    0% {
        transform: scale(1);
    }
    25% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.8);
    }
    75% {
        transform: scale(1);
    }
    100% {
        transform: scale(1);
    }
}
.my_xing {
    -webkit-animation-name: xing;
    -webkit-animation-timing-function: ease-in-out;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-duration: 2.5s;
}