.qr_code span {
    border-radius: 15px;
    visibility: hidden;
	position: fixed;
	top: 150px;
    left: 570px;
    box-shadow: -2px 2px 10px -1px #000000; 
    z-index: 9999;
}

.qr_code span img{
    border-radius: 15px;
    height: 250px;
}


@media screen and (min-width: 1240px) {
	.qr_code:hover span{
		visibility: visible;
	}
}