body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: #f5f5f5;
  margin: 0;
  padding: 0;
  text-align: center;
}

h1 {
  margin-top: 20px;
  font-size: 2rem;
  color: #333;
}

.status {
  margin-top: 10px;
  font-size: 1.2rem;
  color: #444;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 5px;
  justify-content: center;
  margin: 20px auto;
}

.cell {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100px;
  height: 100px;
  background-color: #e0e0e0;
  border: 2px solid #bbb;
  font-size: 3rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s;
}

.cell:hover {
  background-color: #d5d5d5;
}

.cell.winner {
  background-color: #a5d6a7;
}

#newGameButton {
  padding: 10px 20px;
  font-size: 1rem;
  background-color: #2196f3;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

#newGameButton:hover {
  background-color: #1976d2;
}

.message {
  margin-top: 15px;
  font-size: 1.4rem;
  font-weight: bold;
  min-height: 1.6rem;
}