<div class="grid">
  <div class="one">1</div>
  <div class="two">2</div>
  <div class="three">3</div>
  <div class="four">4</div>
  
</div>

* { box-sizing: border-box; }

body {
  margin: 40px;
  background-color: #fff;
  color: #444;
  font: 1.4em Sansita, sans-serif;
  display: flex;
  justify-content:center;
}


.grid {
  display: grid;
  grid-template-columns: repeat(3,100px);
  width: 304px;
  grid-template-rows: repeat(3, 100px);
  background-color: rgb(198,164,154);
  grid-gap:1px;
  border: 1px solid rgb(198,164,154);
}

.grid > * {
  background-color: #fff;
  padding: 20px;
}

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

.two {
  grid-row: 2 / 4;
  grid-column: 1 / 3;
}