CSS

#wrapper  {
  display: flex;
  justify-content: center;

  margin: 10px;
}

#div1,
#div2  {
  display: inline-flex;
  justify-content: center;

  width: 200px;
  height: 200px;
  line-height: 200px;

  color: green;
  font-size: 25px;

  margin: 10px;
  border: 1px green solid;
}