Add Box

.demo {
  
	  display: 
		block
		flex
	;
	  justify-content: 
		flex-start
		flex-end
		center
		space-around
		space-between
		space-evenly
	;
	  align-items: 
		stretch
		flex-start
		flex-end
		center
		basline
	;
	  flex-direction: 
		row
		column
	;

}