.demo-parent {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  grid-template-rows: repeat(2, 80px);
  gap: 15px;
  background: #f8f9fa;
  padding: 15px;
  border-radius: 8px;
}

.demo-parent-item {
  background: #007bff;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  font-weight: bold;
}

.demo-subgrid {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: subgrid;
  background: rgba(220, 53, 69, 0.1);
  border: 2px dashed #dc3545;
  border-radius: 4px;
}

.demo-subgrid-item {
  background: #dc3545;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  font-weight: bold;
}