.puzzle {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
  margin-bottom: 20px;
    background: white;
    border-radius: 16px;
    padding: 1em;
}

.tile {
  width: 120px;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #007bff;
  color: white;
  font-size: 24px;
  font-weight: bold;
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.3s ease;
}

.tile.empty {
  background-color: #f7f7f7;
  cursor: default;
}
.tile.empty:hover {
  background-color: #f7f7f7;
  cursor: default;
}

.tile:hover {
  background-color: #0056b3;
}