.board {
  display: grid;
  grid-template-rows: repeat(3, 1fr);
  grid-template-columns: repeat(3, 1fr);
  width: fit-content;
}
.cell {
  width: 50px;
  height: 50px;
  border: 1px solid black;
  align-content: center;
  text-align: center;
}