.mobile {
  display: none;
}
@media screen and (max-width: 768px) {
  .pc {
    display: none;
  }
  .mobile {
    display: block;
  }
  .floor2 {
    background: center / cover url('/assets/static/image2/maboutbg.png') no-repeat;
    overflow: hidden;
  }
  .floor2 img:nth-child(2) {
    margin: 0.69767442rem auto auto auto;
    width: 8.44186047rem;
    height: 6.69767442rem;
  }
}