@media screen and (max-width : 768px){
    .content-box .item-box{
        display: none;
    }
    .content-box{
        height: auto;
        padding-top: 20px;
    }
    .content-box .item{
        width: 46%;
    }
    .content-box .content_title .title_Mobile:after{
        left: 12rem;
    }
    .content-box .item-box-mobile{
        display: flex;
        flex-wrap: wrap;
        justify-content:space-around;
    }
    .content-box .item-box-mobile .item{
        margin-bottom: 20px;
    }
    .content-box .item-box-mobile .item-1 {
        background: url("/img/purificationScheme/bg-1.png") no-repeat center;
        background-size: cover;
    }
    .content-box .item-box-mobile .item-2 {
        background: url(/img/purificationScheme/bg-2.png) no-repeat 53% center;
        background-size: cover;
    }
    .content-box .item-box-mobile .item-3 {
        background: url(/img/purificationScheme/bg-3.png) no-repeat center;
        background-size: cover;
    }
    .content-box .item-box-mobile .item-4 {
        background: url(/img/purificationScheme/bg-4.png) no-repeat center;
        background-size: cover;
    }
    .item-box-mobile .unfold-box{
        position: relative;
    }
    .item-box-mobile .unfold-box-active{
        bottom: 0;
        left: 0;
    }
    .ray_box .item-box-mobile  .title{
        font-size: 3.5vw;
        display: block;
    }
    .item-box-mobile .collapse-box{
        display: flex !important;
        padding: 20px 10px;
    }
    .unfold-box{
        display: none;
    }
    .content-box .info {
        padding: 0 20px;
    }
    .content-box .title{
        margin-bottom: 20px;
    }
    .collapse-box .collapse-desc{
        width: 35vw;
        font-size: 2.8vw;
    }
    .content-box .info >p {
        font-size: 3.6vw;
        line-height: 7vw;
    }
    .phone-box .left .item-box{
        margin-left: 5.3vw;
        font-size: 2.5vw;
    }
    .ray_box .title_Mobile{
        font-size: 2.75rem;
        font-weight: 600;
    }
}