Пример использования свойства justify-content (для флекс контейнеров)

justify-content: flex-start

A

B

C

justify-content: flex-end

A

B

C

justify-content: center

A

B

C

justify-content: space-between

A

B

C

justify-content: space-around

A

B

C

justify-content: space-evenly

A

B

C