body {
  font-family: sans-serif;
  background-image: url("plazma.png");
  background-repeat: repeat;
}

#puzzle-container {
  display: grid;
  grid-gap: 10px;
  margin: 50px auto;
  background-color: #eee;
  padding: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

.puzzle-piece {
  background-size: cover;
  background-position: center;
  cursor: pointer;
  transition: transform 0.3s ease-in-out;
}

.puzzle-empty {
  background-color: #fff;
}

#reset-btn {
  width: 30%;
  margin: 20px auto;
  padding: 10px 20px;
  font-size: 18px;
  background-color: #3d9970;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease-in-out;
}

#reset-btn:hover {
  background-color: #2ecc71;
}

@media (min-width: 480px) {
  #puzzle-container {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    width: 300px;
    height: 300px;
  }
}

@media (min-width: 640px) {
  #puzzle-container {
    width: 400px;
    height: 400px;
  }
}

@media (min-width: 992px) {
  #puzzle-container {
    width: 600px;
    height: 600px;
  }
}