auto zoom image css

.parent:hover .child,
.parent:focus .child {
  transform: scale(1.2);
}

/* Point-zoom Container */.point-img-zoom img {  transform-origin: 65% 75%;  transition: transform 1s, filter .5s ease-out;}/* The Transformation */.point-img-zoom:hover img {  transform: scale(5);}

.parent {
  width: 400px; 
  height: 300px;
}

.child {
  width: 100%;
  height: 100%;
  background-color: black; /* fallback color */
  background-image: url("images/city.jpg");
  background-position: center;
  background-size: cover;
}