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

h1, h2 {
  margin-bottom: 20px;
}

button {
  padding: 10px 20px;
  margin: 10px;
  font-size: 18px;
  cursor: pointer;
}

.menu, .game {
  padding: 50px 20px;
}

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

.cell {
  width: 100px;
  height: 100px;
  background: white;
  font-size: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid #ccc;
  cursor: pointer;
}