Answers for "what does display flex do"

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

display flex

{
	display: fixed;
	flex-direction: row;
	flex-wrap: nowrap;
	justify-content: flex-start;
	align-items: stretch;
	align-content: stretch;
}

flexbox css

.container {
  justify-content: flex-start | flex-end | center | space-between | space-around | space-evenly | start | end | left | right ... + safe | unsafe;
}