Child

.container > div {

  /\* This: \*/
  flex: 1 0 auto;
  /\* Is equivalent to this: \*/
  flex-grow: 1;
  flex-shrink: 0;
  flex-basis: auto;

  order: 1;

  align-self: flex-start;  /\* left \*/
  margin-left: auto;       /\* right \*/

}