body {
  display: flex;
  flex-direction: column;
  justify-content: top;
  align-items: center;
  height: 100vh;
  margin: 0;
  background-color: #f0f0f0;
}

#puzzle-container {
  display: grid;
  grid-template-columns: repeat(4, 100px);
  grid-template-rows: repeat(4, 100px);
  gap: 1px;
}

.puzzle-piece {
  width: 100px;
  height: 100px;
  background-size: 400px 400px;
  cursor: pointer;
  border: 1px solid #ccc;
}

#completion-message {
  margin-top: 20px;
  font-size: 24px;
  font-weight: bold;
  color: green;
}

#save-button {
  margin-top: 20px;
  padding: 10px 20px;
  font-size: 16px;
  background-color: red;
  color: white;
  border: none;
  cursor: pointer;
}