.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 5px;
  margin: 20px auto;
}
.cell {
  width: 100px;
  height: 100px;
  font-size: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: #f0f0f0;
  border: 1px solid #999;
}
#status {
  text-align: center;
  font-size: 1.2em;
}
#reset {
  display: block;
  margin: 10px auto;
  padding: 5px 10px;
}