Untitled

#board {
  width: 150px;
  display: flex;
  flex-wrap: wrap;
}

.cell {
  width: 50px;
  height: 50px;
  border: 1px solid #000;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  cursor: pointer;
}

#result {
  margin-top: 20px;
  font-size: 24px;
}