.hamster div{
    width: 320px;
    height: 320px;
	max-width: 100%;
    background-image: url(/uploads/hamster.jpg);
    background-size: contain;
    background-repeat: no-repeat;
}
.dogs div{
    width: 320px;
    height: 320px;
	max-width: 100%;
    background-image: url(/uploads/dogs.jpg);
    background-size: contain;
    background-repeat: no-repeat;
}