how to use image zoom effect in css

1/*Zoom on hover*/
2
3<style>
4.zoom {
5  padding: 50px;
6  background-color: green;
7  transition: transform .2s; /* Animation */
8  width: 200px;
9  height: 200px;
10  margin: 0 auto;
11}
12
13.zoom:hover {
14  transform: scale(1.5); /* (150% zoom)*/
15}
16</style>
17
18<div class="zoom"></div>
19
20/*credits: w3schools.com */

1.parent:hover .child,
2.parent:focus .child {
3  transform: scale(1.2);
4}

1/* 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);}

1.child::before {
2  content: "";
3  display: none;
4  height: 100%;
5  width: 100%;
6  position: absolute;
7  top: 0;
8  left: 0;
9  background-color: rgba(52, 73, 94, 0.75);
10}
11
12.parent:hover .child:before,
13.parent:focus .child:before {
14  display: block;
15}

1.parent {
2  width: 400px; 
3  height: 300px;
4}
5
6.child {
7  width: 100%;
8  height: 100%;
9  background-color: black; /* fallback color */
10  background-image: url("images/city.jpg");
11  background-position: center;
12  background-size: cover;
13}