<div class="grid">
  <div class="grid-item grid-item--1"></div>
  <div class="grid-item grid-item--2"></div>
  <div class="grid-item grid-item--3"></div>
  <div class="grid-item grid-item--4"></div>
  <div class="grid-item grid-item--5"></div>
  <div class="grid-item grid-item--6"></div>
  <div class="grid-item grid-item--7"></div>
  <div class="grid-item grid-item--8"></div>
  <div class="grid-item grid-item--9"></div>
  <div class="grid-item grid-item--10"></div>
</div>

body {
  box-sizing: border-box;
}

.grid {
  display: grid;
  grid-gap: 10px;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(6, 1fr);
  min-height: 200px;
}

.grid-item {
  background: red;
}

.grid-item--1 {
  grid-row-end: span 2;
  grid-column-end: span 6;
}

.grid-item--2 {
  grid-column-end: span 3;
  grid-row-end: span 2;
}

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

.grid-item--5 {
  grid-column-end: span 3;
  grid-row-end: span 2;
}

.grid-item--6 {
  grid-column-end: span 3;
  grid-row-end: span 2;
}

.grid-item--7 {
  grid-column-end: span 6;
  grid-row-end: span 2;
}

.grid-item--8 {
  grid-column-end: span 4;
  grid-row-end: span 2;
}

.grid-item--9 {
  grid-column-end: span 4;
  grid-row-end: span 2;
}

.grid-item--10 {
  grid-column-end: span 4;
  grid-row-end: span 2;
}