.image__zoom {
  width: 530px;
  height: 409px;
  box-sizing: border-box;
  overflow: hidden;
  position: relative;
  background: url();
  background-size: auto 100%;
  background-position: 50% 50%;
  cursor: zoom-in;
  transition: background-size .5s;
}
.image__zoom:hover {
  background-size: auto 300%;
}