flex 1 vs flex 2 code example

Example 1: flex parameters

flex: none | [ <'flex-grow'> <'flex-shrink'>? || <'flex-basis'> ]

Example 2: what does flex do

The flex CSS property sets how a flex item will grow or shrink to fit the space
available in its flex container. It is a shorthand for flex-grow , flex-shrink ,
and flex-basis .