justify-content: space-around
a1
a2
a3
a1; height: 30px
a2; height: 30px
a3; height: 30px
a1; flex-basis: 30px
a2; flex-basis: 30px
a3; flex-basis: 30px
flex-grow: 1
a1
a2; flex-grow: 1
a1; flex-grow: 1
a2; flex-grow: 1
a1; flex-grow: 1
a2; flex-grow: 3
a3; flex-grow: 1
margin: auto
a1; margin: 0 auto
a2; margin: 0 auto
a1; margin: 0 auto
a2; margin: 0
a1; margin: 0
a2; margin: 0 auto
a1; margin: 0 auto
a2; margin: 0 auto
a3; margin: 0 auto
align-items: flex-end; justify-content: flex-end
a1
a2
order: 1
a1; order: 1
a2; order: 0