what is flex in css explain it with example

Example 1: css flexbox syntax

Display: flex 
Flex-direction: row | row-reverse | column | column-reverse
align-self: flex-start | flex-end | center | baseline | stretch
justify-content: start |  center | space-between | space-around | space-evenly

Example 2: css flex

/* Flex */
.anyclass {
	display:flex;
}
/* row is the Default, if you want to change choose */
.anyclass {
	display:flex;
 	flex-direction: row | row-reverse | column | column-reverse;
}

.anyclass {
  /* Alignment along the main axis */
  justify-content: flex-start | flex-end | center | space-between | space-around | space-evenly | start | end | left | right ... + safe | unsafe;
}