background size in css
Background Size is Responsible for Setting a Background picutre in a given
Contaiener in which you apply that special Background
/* This will make width as static and height as auto */
/* These three are quite same */
background-size: 100vw auto;
background-size: 100%;
background-size: cover;
/* for getting full width and height every time */
background-size: 100vw 100vh;