@media screen  and (max-width:750px){
   
    /*轮播*/ 
    .banner{
        width: 100%;
        height: auto;
        background-color: transparent;
    }
    .swiper-wrapper,.swiper-slide,.swiper-slide a,.swiper-slide a img{
        height: auto !important;
    }
    .pagination{
        display: none;
    }
    .necessary,.pretend_wrap,.software_re{
        width: 100%;
    }
    .necessary ul{
        display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: 0 10px;
    box-sizing: border-box;
    }
     .necessary ul li{
         width: 29%;
         display: flex;
         flex-direction: column;
         justify-content: center;
         align-items: center;
         height: auto;
     }
     .necessary ul li .pic{
         margin: 0;
     }
     .necessary ul li .neli_r{
         width: 100%;
         text-align: center;
     }
     .necessary ul li .neli_r .neli_t{
         margin-top: 10px;
         white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
     }
     .necessary ul li .neli_r .li_down{
         display: inline-block;
     }
     .necessary ul li .neli_r .x{
         margin-top: 4px;
     }
     .pretend_left{
         width:100%;
     }
     .pretend_left ul{
         display: flex;
         flex-wrap: wrap;
         justify-content: space-around;
     }
     .pretend_left ul li{
         width:26%;
         display: flex;
         flex-direction: column;
         align-items: center;
     }
    .software_re ul{
        display: flex;
        flex-wrap: wrap;
        justify-content: space-around;
        
    }
    .software_re ul li {
        width: 45%;
        margin: 4px 0;
        display: flex;
    justify-content: center;
    align-items: center;
    }
    .software_re ul li span{
        display: none;
    }
    .varieties{
        width: 100%;
        display: flex;
        flex-wrap: wrap;
        justify-content: space-around;
    }
    .varieties_w{
        width: 50%;
        margin:12px 0;
        box-shadow: none;
    }
    .varieties_t{
        background: linear-gradient(0deg, #FFFCFC 0%, #EAECED 100%);
    }
    .varieties_w ul li{
        display: flex;
        justify-content: space-around;
        align-items: center;
    }
}