@media screen and (min-width: 768px) {
    .banner {
        width: 100%;
        height: 350px;
        background: #000000 url('../image/banner-index4.png') center center;
        text-align: center;
    }
    .banner div {
        padding-top: 200px;
    }
    .banner a {
        display: inline-block;
        width: 70px;
        height: 30px;
        line-height: 30px;
        color: #ffffff;
        margin: 0px 15px;
    }
    .main {
        max-width: 1000px;
        margin: 0px auto;
        padding-bottom: 40px;
    }
    .cntbox{
        width: 100%;
        max-width: 1000px;
        margin-top: 50px;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    .cntbox .about-img{
        
        padding: 25px 40px 25px 25px;
    }
    .cntbox .about{
        
    }
    .twoimg{
        display: flex;
        width: 100%;
        max-width: 1000px;
        margin-top: 50px;
    }
    .twoimg .mask{
        display: flex;
        position: absolute;
        background-color: rgba(0, 0, 0, 0.5);
        width: 100%;
        height: 300px;
        color:#fff;
        font-size: 18px;
        font-weight: 600;
        text-align: center;
        flex-direction:column;
        justify-content: center;
    }
    .twoimg .mask div:nth-child(-n+2){
        margin-bottom: 20px;
    }
    .twoimg .mask div:nth-child(2){
        font-size: 30px;
    }
    .twoimg .leftimg,.rightimg{
        width: 50%;
        position: relative;
    }
    .twoimg .leftimg{
        background: url('../image/contactimg2.jpg') right no-repeat;
        background-size: cover;
        height: 300px;
    }
    .twoimg .rightimg{
        background: url('../image/contactimg1.jpg') right no-repeat;
        background-size: cover;
        height: 300px;
    }
    .about {
        margin-top: 0px;
    }
    .about div {
        display: inline-block;
        padding: 0px 0px 0px 0px;
        line-height: 24px;
        text-align: justify;
    }
    .about div:nth-child(3){
        border-top: 1px solid #e0e0e0;
        padding-top: 12px;
    }
    .about .entext{
        color:#9b9b9b;
    }
    .bigtitle {
        margin: 0px;
        padding: 0;
        text-align: left;
        display: block;
    }
    .bigtitle h2 {
        text-align: left;
        font-weight: 700;
        color: #4a4a4a;
    }
}

@media screen and (max-width: 768px) {
    .banner div {
        padding-top: 60px;
        text-align: center;
    }
    .banner a {
        display: inline-block;
        width: 70px;
        height: 30px;
        line-height: 30px;
        color: #333333;
        margin: 0px 15px;
    }
    .banner a.hover_a {
        color: #0077da;
    }
    .bigtitle {
        padding: 0;
    }
    .bigtitle h2{
        padding: 0;
    }
    .about {
        width: 100%;
        margin: 0px auto;
        margin-bottom: 0px;
        box-sizing: border-box;
        padding: 20px;
        padding-top: 40px;
    }
    .about div {
        
        text-indent: 28px;
        line-height: 24px;
        text-align: left;
    }
    .about .entext{
        margin-top: 20px;
        margin-bottom: 20px;
        color: #9b9b9b;
    }
    .cntbox{
        position: relative;
    }
    .about-img{
        position: absolute;
        top:0;
        right:40px;
    }
    .teamimg{
        top:20px;
    }
    .about-img img{
        width: 100px;
    }

    .twoimg{
        display: none;
    }
}

@media screen and (max-width: 320px) {
    .tel_contact {
        display: inline-block;
        font-size: 13px;
        font-weight: 300;
        padding: 20px 20px 0px 20px;
        line-height: 24px;
        box-sizing: border-box;
        width: 100%;
    }
}