.grid-container {
  display: grid;
  grid-gap: 10px;
}

/* Make "item1" start on row-line 1 and end on row-line 4: */
.grid-item {
	grid-row: 1 / 4;
}

/* Make "item1" start on row 1 and span 2 rows: */
.grid-item {
	grid-row: 1 / span 2;
}

/* Make "item1" start on col 1 and end on col 2: */
.grid-item {
	grid-column: 1 / 2;
}