[class^="box-"] {
  background-color: skyblue;

/* To place the letter at the center */
  display: grid;
  place-items: center;
}

.item-a {
  grid-column: 1;
  grid-row: 1 / 3;
}
.item-e {
  grid-column: 5;
  grid-row: 1 / 3;
}

grid-template-columns: auto auto auto;

/*style.css*/
.container {
  display: grid;
}