<div class="grid">
  
  
</div>

.grid {
  display: grid;
  grid-template-columns: repeat(6,100px);
  grid-template-rows: repeat(3, 100px);
  border: 5px solid rgb(198,164,154);
  border-radius: 5px;
}

.grid::after {
  content: "";
  padding: 20px;
  border: 5px solid rgb(198,164,154);
  background-color: rgba(198,164,154,.2);
  border-radius: 5px;
  grid-column: 2 / 4;
  grid-row: 2;
}