@media screen and (min-width:751px) {
    * {
        margin: 0;
        padding: 0;
        border: 0;
    }
    div{
        margin: 0;
        padding: 0;
        border: 0;
       
    }
    .w {
        width: 1200px;
        margin: 0 auto;
    }
    ul li{
        list-style: none;
    }
    .ck-slide {
        width: 100%;
        min-width: 1200px;
        height: 474px;
        position: relative;
    
    }
    .imageclass {
        width: 100%;
        height: 474px;
        position: relative;
     object-fit: cover;
    }
    header {
        width: 100%;
        height: 474px;
        min-width: 1200px;
        /* background-image: url("../aiimage/videophone/bannerbg.png"); */
        background-size: 100% 100%;
        position: relative;
    }
    .top {
        position: absolute;
        top: 119px;
        /* left: 360px; */
        width: 533px;
        text-align: left;
    }
    .title_one{
        font-family: Alibaba PuHuiTi;
        font-weight: 500;
        font-size: 36px;
        color: #FFFFFF;
    }
    .xian_one{
        width: 100px;
        height: 4px;
        background: #F5F2F6;
        margin: 34px 0 ;
    }
    .content{
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 16px;
        color: #FFFFFF;
        line-height: 30px;
    }
    #sectionbox{
        width: 100%;
        height: 1384px;
        /* background-color: red; */
        background:#F6F8FB;
        padding: 69px 0;
        box-sizing: border-box;
    }
    .section_two{
        margin-top: 79px;
        display: flex;
        flex-wrap: wrap;
    }
    .section_two li{
        display: flex;
        flex-direction: column;
        align-items: center;
        margin-right: 60px;
        margin-bottom: 39px;
    }
    .section_two li p{
        height: 20px;
        font-family: Alibaba PuHuiTi;
        font-weight: 500;
        font-size: 20px;
        color: #138BFF;
        line-height: 20px;
        margin-top: 19px;
    }
    .section_two li:nth-child(3n){
        margin-right: 0;
    }
}