Check out example codes for "zoom image css". It will help you in understanding the concepts better.

Code Example 1

transform: scale(1.5);

Code Example 2

/*Zoom on hover*/

<style>
.zoom {
  padding: 50px;
  background-color: green;
  transition: transform .2s; /* Animation */
  width: 200px;
  height: 200px;
  margin: 0 auto;
}

.zoom:hover {
  transform: scale(1.5); /* (150% zoom)*/
}
</style>

<div class="zoom"></div>

/*credits: w3schools.com */

Code Example 3

img:hover {
transform: scale(1.3);
}

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