/* body{
    margin: 0 auto;
    width: 1200px;
    background: url(https://libvpn.swfu.edu.cn/vpn/89/http/P75YPLUCMF6XT6LWF3UX87SPMNYA/byq/xhtml/images/public/2023sytlbj.jpg;vpn_img) no-repeat top center;
}
.lhlj{
    display: block;
    width: 100%;
    text-align: right;
}
@media screen and (max-width: 1200px) {
    body{
        width: 100%;
    }
} */
/* body{
    -webkit-filter: grayscale(100%);
-webkit-filter: grayscale(1); 
-moz-filter: grayscale(100%);
-ms-filter: grayscale(100%);
-o-filter: grayscale(100%);
filter: gray; 
} */