.manage-img {
    display: inline-block;
    width: 180px;
    height: 180px;
    float: left;}
.manage-img img {
    height: 100%;}
.manage-jieshao {
    display: inline-block;
    padding-left: 15px;
    width: 50%;}
@media screen and (max-width: 1550px){
 .manage ul li, .experiment ul li {
    padding: 10px;}
}
@media screen and (max-width: 1400px){
.manage ul li, .experiment ul li {
    padding: 10px;}
  .manage-jieshao {
  width:46%;} 
}
@media screen and (max-width: 1200px){
 .manage ul li, .experiment ul li{
    padding: 10px;}
  .manage-jieshao{
    width:100%;}
}