justify-content: flex-end

flex item 1
flex item 2
flex item 3
flex item 4

justify-content: center

flex item 1
flex item 2
flex item 3
flex item 4

justify-content: space-between

flex item 1
flex item 2
flex item 3
flex item 4

justify-content: space-around

flex item 1
flex item 2
flex item 3
flex item 4