vh vw css code example

Example 1: vw css

Viewport Width (vw). This unit is based on the width of the viewport. 
A value of 1vw is equal to 1% of the viewport width.

Example 2: vh vs vw css

vh and vw measure the percentage of height and width of the viewport respectively.
 vw and vh are a percentage of the window width and height, 
respectively: 100vw is 100% of the width, 80vw is 80%, etc. 
This seems like the exact same as the % unit, which is more common