.wxqrcode {
    position: relative;
}
 
.wxqrcode img.qrcodeimg {
  position: absolute;
  z-index: 99;
  top: 50px;
  right: 7px;
  width: 10rem;
  max-width: none;
  height: 10rem;
  transform: scale(0);
  transform-origin: top;
  opacity: 0;
  border: 2.5px solid #ffc107;
  -webkit-transition: all .4s ease-in-out;
  -o-transition: all .4s ease-in-out;
  transition: all .4s ease-in-out;
 
}
 
.wxqrcode:hover img.qrcodeimg {
    transform: scale(1);
    opacity: 1;
}