@media screen and (max-width:640px) {
    .syzn .syzn_t li{
        height: 220px;
    }

    .syzn .syzn_b ul{
        width: 300px;
        height: 235px;
        box-sizing: border-box;
        margin: 0px 0px 0px -6px;
        padding-top: 33px;
    }

    .syzn .syzn_b {
        position: absolute;
    }

    .syzn .syzn_t li:nth-child(1){
        height: 230px;
    }
    .syzn .syzn_b ul:nth-child(1){
        height: 245px;
    }

    .syzn .syzn_t li:nth-child(3){
        height: 200px;
    }
    .syzn .syzn_b ul:nth-child(3){
        height: 215px;
    }
    .syzn .syzn_t li:nth-child(4){
        height: 120px;
    }
    .syzn .syzn_b ul:nth-child(4){
        height: 140px;
    }

    .header .login .user{
        text-align: right;
    }

    .header .login .user>a{
        padding-right: 20px;
    }
}

/*.syzn .syzn_b ul:last-child{
    border-right: none;
}*/