.grid-demo-1 {
  display: grid;
  grid-template-columns: repeat(2, 100px);
  grid-auto-columns: 150px;
  gap: 10px;
  background-color: #f0f0f0;
  padding: 15px;
  border-radius: 5px;
}

.grid-item-1 {
  background-color: #4CAF50;
  color: white;
  padding: 20px;
  text-align: center;
  border-radius: 4px;
  font-weight: bold;
}

.grid-item-1:nth-child(3) { grid-column: 3; }
.grid-item-1:nth-child(4) { grid-column: 4; }