@media screen and (max-width:768px) {
    
    .top_3>.big_ld {
        width: 200px;
        height: 200px;
        top: 42%;
        left: 8%;
    }
    
    .top_3>.people_ld {
        width: 200px;
        height: 200px;
        top: -13%;
        right: -73%;
    }
    /* **************************智慧******************* */
    .top_2>.rt>p {
        line-height: 4vw;
    }
}