.nav_son{width:200px;left:50%;transform:translateX(-50%);}
.num_c>ul{justify-content: space-between;}
.num_c>ul>li{padding:0 20px;}
.num_c p{text-align: center;font-size: 16px;}
.num_c em{font-size: 16px;}
.contact_title{width:fit-content;padding:0 20px;}

@media screen and (max-width: 768px) {

    .num_c>ul>li{padding:0 0px;}
    .dfs{align-items: flex-start;}
    .nswsfenlei_2019 li{padding:0 10px;}
    .nswsfenlei_2019 li a{font-size: 14px;}
}