body {
  font-family: Arial;
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(8, 40px);
  gap: 3px;
  justify-content: center;
  margin: 10px;
}

.cell {
  width: 40px;
  height: 40px;
  border: 1px solid black;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}