.grid-demo-4 {
  display: grid;
  grid-template-columns: 100px;
  grid-auto-columns: minmax(150px, 1fr);
  gap: 10px;
  background-color: #f0f0f0;
  padding: 15px;
  border-radius: 5px;
  resize: horizontal;
  overflow: auto;
  width: 450px;
}

.grid-item-4 {
  background-color: #9C27B0;
  color: white;
  padding: 20px;
  text-align: center;
  border-radius: 4px;
  font-weight: bold;
}

.grid-item-4:nth-child(2) { grid-column: 2; }
.grid-item-4:nth-child(3) { grid-column: 3; }