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

.grid {
  display: grid;
  grid-template-columns: repeat(6, auto); 
  grid-gap: 20px;
}

.grid-item {
  padding: 50px 20px;
  background-color: red;
}

.grid-item--1 {
  grid-column: 1 / 4;
}

.grid-item--2 {
  grid-column: 4 / -1;
}

.grid-item--3,
.grid-item--4,
.grid-item--5 {
  grid-column: span 2;
}