.flex-container {
  display: flex;
  flex-wrap: nowrap;
  /*background-color: DodgerBlue;*/
}

.flex-container > div {
  /*background-color: #f1f1f1;*/
  /*width: 100px;*/
  margin: 2px;
  text-align: center;
  line-height: 80px;
  font-size: 30px;
}