how to tranform size in html code example

Example 1: transform scale

transform: scale(2, 0.5); /* Equal to scaleX(2) scaleY(0.5) */

Example 2: css transform property

Read this comprehensive article about CSS animation transform property. 
It also has many useful examples that help you in best way.

https://medium.com/swlh/learn-css-transform-animation-zero-to-hero-6a2a643bd56b