<section class="grid-1">
  <div class="item-1">1</div>
  <div class="item-2">2</div>
  <div class="item-3">3</div>
  <div class="item-4">4</div>
  <div class="item-5">5</div>
</section>

body {
  padding-top: 20px;
  background: #f5f7f8;
}

.grid-1 {
  display: grid;
  width: 100%;
  max-width: 750px;
  margin: 0 auto;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 100px);
  grid-gap: 20px;
}

/* items */

.grid-1 div {
  color: white;
  font-size: 20px;
  padding: 20px;
  }

/* specific item styles */

.item-1 {
  background: #b03532;
  grid-column: 1 / span 2;
  grid-row: 1 / span 2;
}
.item-2 {
  background: #33a8a5;
}
.item-3 {
  background: #30997a;
}
.item-4 {
  background: #6a478f;
  grid-column: 3;
  grid-row: 2 / span 2;
}
.item-5 {
  background: #da6f2b;
}