SOURCE

    <div class="grid-container">
        <div class="item1">1</div>
        <div class="item2">2</div>
        <div class="item3">3</div>
        <div class="item4">4</div>
       
    </div>

.grid-container{
  display: grid;
  grid-template-columns: 100px 100px 100px;
  grid-template-rows: 100px 100px 100px;
  height: 100%;
  background: #d4d4d4;
  grid-gap: 10px;
}
.grid-container > div {
  border: 1px grey solid;
}
.item1{
  grid-column: 1/3;
  grid-row: 1;
}
.item2{
  grid-column: 3;
  grid-row: 1/3;
}
.item3{
  grid-column: 2/4;
  grid-row: 3;
}
.item4{
  grid-column: 1;
  grid-row: 2/4;
}

html,body{
  height: 100%;
  width: 100%;
}