.playground {
  background-color: #f9f9f9;
  padding: 20px;
  border-radius: 8px;
  border: 1px solid #ddd;
}

.controls {
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.controls label {
  font-weight: bold;
  margin-right: 5px;
}

.controls select, .controls input {
  padding: 5px 8px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(2, 100px);
  grid-auto-columns: 150px;
  gap: 10px;
  background-color: #fff;
  padding: 15px;
  border-radius: 5px;
  border: 2px dashed #ccc;
  min-height: 120px;
}

.demo-item {
  background-color: #3F51B5;
  color: white;
  padding: 15px;
  text-align: center;
  border-radius: 4px;
  font-weight: bold;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.demo-item:nth-child(3) { grid-column: 3; }
.demo-item:nth-child(4) { grid-column: 4; }
.demo-item:nth-child(5) { grid-column: 5; }