#qr-code{
  background:#fff;
  height:120px;
  width:120px;
  position:fixed;
  transition:left 0.3s;
  left:0;
  top:400px;
  z-index: 999;
}

@media screen and (min-width: 0px) and (max-width: 700px) {
      #qr-code {    display: none;  }
    }