body {
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
  margin: 0;
  padding: 0;
}

header {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 10px;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  text-align: center;
  font-size: 24px;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  background-color: #fff;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

.cell {
  width: 100px;
  height: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 36px;
  border: 1px solid #ccc;
  cursor: pointer;
  user-select: none;
}

.cell.X {
  color: #2196f3;
}

.cell.O {
  color: #f44336;
}

.status {
  text-align: center;
  font-size: 20px;
  margin-top: 10px;
}