.container {
  display: inline-grid;
  grid-template-columns: auto auto auto;
  background-color: dodgerblue;
  padding: 10px;
}

.container > div {
  background-color: #f1f1f1;
  border: 1px solid black;
  padding: 20px;
  font-size: 30px;
  text-align: center;
}