@media (max-width:640px) {
  .banner {
    height: 43.75vw;
  }
  .yxjj {
    width: 100%;
    box-sizing: border-box;
    padding: 0 10px 20px 10px;
  }
  .yxjj .pic-wrapper {
    width: 100%!important;
  }
  .yxjj .more {
    margin-top: 20px;
  }
}