Answers for "can i use display flex"

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

css all flex properties

.item {
  flex-grow: 4; /* default 0 */
}