body {
        font-family: -apple-system-font, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    
    * {
        margin: 0;
        padding: 0;
    }    
    h2 {
        font-weight: normal;
    }
    #bg1{
        display: inline-block;
    }
    #bg2{
        display: none;
    }
    .full{
        width: 100%;
        height: 100%;
    }
    .container {
        /*height: 48px;*/
        position: fixed;
        width: 100%;
        top: 0;
        left: 0;
        z-index: 999;
        background-color: #050835;
    }
    
    .header-left {
        float: left;
        margin-left: -5%;
    }
    
    .header-left img {
        width: 300px;
        vertical-align: middle;
    }
    
    .header-right {
        width: 60%;
        margin-right: -20%;
        float: right;
        margin-right: -10%;
    }
    .tab-menu{
        display: none;
    }
    
    .header-right li a {
        text-decoration: none;
        color: #fff;
        cursor: pointer;
    }
    .header-right li a:hover{
        color: #1777f2;
    }
    
    .company-back{
        margin-top: 3rem;
        width: 100%;
        position: relative;
    }
    
    .service {
        top: 0;
        left: 0;
        width: 100%;
    }
    
    .aboutus {
        text-align: justify;
        /* padding-bottom: 4rem; */
        padding-top: 2rem;
        margin-top: 6rem;
        width: 100%;
        /* background-image: url('../images/about_img_bg.png');
        background-size: 100% 100%;
        background-position: 0 100%; */
        background-color: #f2f2f2;
    }
    .aboutus h5{
        font-size: 1.3rem;
        font-weight: 500;
    }
    .aboutus p {
        color: #666;
        font-size: 16px;
    }
    
    .service-product {
        position: relative;
        margin-bottom: 4rem;
    }
    .service-product>img{
        width: 100%;
    }
    
    .contactus-img {
        width: 100%;
        min-height: 10rem;
        max-height: 15rem;
    }
    
    .contactus {
        position: absolute;
        top: 0;
        left: 0;
        width: 84%;
        margin: 3rem 8% 0;
    }

    .contactus div div img{
        width: 5rem;
        margin-bottom: 1rem;
    }
    
    .email-address {
        text-align: center;
        line-height: 1rem;
        margin-bottom: 2rem;
    }
    
    .email-address > div {
        margin-bottom: .6rem;
    }
    
    .email-address p {
        display: inline-block;
        margin-left: .4rem;
        margin-bottom: .2rem;
        font-size: .85rem;
    }
    
    .email-address .icon {
        width: 2rem;
        height: 1.2rem;
        display: inline-block;
        background-image: url(../images/icon-small.png);
        background-repeat: no-repeat;
        background-size: 2rem 3rem;
    }
    
    .email-address .email .icon {
        background-position: -0.4rem 0.27rem;
    }
    
    .email-address .address .icon {
        background-position: 0.4rem -1.8rem;
    }
    
    .footer {
        width: 100%;
        font-size: .7rem;
        color: #888;
        text-align: center;
        margin-top: 5rem;
        margin-bottom: 1rem;
    }
    
    /*图片和低行文字居中*/
    .img-text-center {
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        width: 32.33%;
    }
    /*图片集*/
    .image-item {
        background-color: #fff;
        margin: 1% auto 0;
        display: flex;
        justify-content: space-between;
    }
    .ipad-image-item{
        display: none;
    }
    .image-left{
        width: 41%;
        height: 100%;
    }
    .image-right{
        width: 29%;
        height: 100%;
    }
    .image-left-child1{
        width: 100%;
        height: 60%;
        position: relative;
    }
    .video-play{
        position: absolute;
        top: 50%;
        left: 50%;
        width: 40px;
        height: 40px;
        transform: translate(-50%,-50%);
    }
    .image-left-child2{
        width: 50%;
        height: 39%;
        margin-top: 1%;
    }
    .image-left-child3{
        width: 49%;
        height: 39%;
        float: right;
        margin-top: 1%;

    }
    .image-right-child1{
        width: 100%;
        height: 50%;
    }
    .image-right-child2{
        width: 50%;
        height: 49%;
    }
    .image-right-child3{
        display: inline-block;
        width: 48%;
        height: 49%;
        background-color: #00d171;
        float: right;
    }
    .more-content{
        display: block;
        width: 127px;
        height: 40px;
        font-size: 14px;
        color: #1777f2;
        border-radius: 4px;
        border: 1px solid rgb(23,119,241);
        outline: none;
        background-color: transparent;
        cursor: pointer;
        margin: 3rem auto 0;
    }
    .video-box{
        width: 670px; 
        height: 360px; 
        position: fixed; 
        top: 50%; 
        left: 50%; 
        transform: translate(-50%,-50%);
        display: none;
        z-index: 2;
    }

    .close-video{
        width: 20px;
        height: 20px;
        border-radius: 50%;
        position: absolute;
        top: 0;
        right: 0;
        background-color: #000;
        transform: translate(45%, -45%);
        opacity: .8;
    }
    .tab-box{
        position: fixed;
        opacity: 0;
    }

    video{
        width: 100%;
        height: 100%;
        object-fit: fill;
    }
   /* .mongolia{
        position: fixed;
        width: 100%;
        height: 100%;
        background-color: #333;
        opacity: .5;
        top: 0;
        left: 0;
        z-index: 1;
        display: none;
    }*/