.wrapper {
  width: 700px;
  margin:0 auto;
  background:beige;
  height: 700px;

  display: flex;
  flex-direction:row;
  flex-wrap:wrap;
  justify-content: center;
  align-items: center;
  /* align-content:space-evenly; */
  /* flex-flow:row wrap;  écriture raccourcie des 2 prop. précédentes */
}

.wrapper div {
  width: 50px;
}

.wrapper div:nth-of-type(1) {
  background-color:rebeccapurple;
  order:2;
}
.wrapper div:nth-of-type(2) {
  background-color:crimson;
}
.wrapper div:nth-of-type(3) {
  background-color:yellowgreen;
}
.wrapper div:nth-of-type(4) {
  background-color:tomato;
  align-self:flex-start
}
.wrapper div:nth-of-type(5) {
  background-color:olivedrab;
  order:2;
}
.wrapper div:nth-of-type(6) {
  background-color:skyblue;
  align-self:flex-end;
}
.wrapper div:nth-of-type(7) {
  background-color:salmon;
  align-self:stretch;
}
.wrapper div:nth-of-type(8) {
  background-color:slateblue
}
.wrapper div:nth-of-type(9) {
  background-color:deeppink
}
.wrapper div:nth-of-type(10) {
  background-color:palevioletred
}