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

.cell {
  background: #eee;
  border: 2px solid #333;
  font-size: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}