CSS Grid - Number of Columns can be different in the first row than second row [duplicate]

Answer 1

This is what I wanted actually.

section {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 5px;
}

div {
  height: 50px;
  background: red;
}
div:first-child {
  grid-column: 1 / 3;
}

<section>
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
  <div>6</div>
  <div>7</div>
  <div>8</div>
</section>

Answer 2

You can try like below:

section {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-gap: 5px;
}

section div {
  grid-column: span 3;
  height: 50px;
  background: red;
}

section div:nth-child(n + 3) {
  grid-column: span 2;
}

<section>
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
  <div>6</div>
  <div>7</div>
  <div>8</div>
</section>