body {
  font-family: sans-serif;
  text-align: center;
  background-color: #f0f0f0;
}

#game-board {
  display: grid;
  grid-template-columns: repeat(5, 60px);
  grid-template-rows: repeat(5, 60px);
  gap: 4px;
  margin: 20px auto;
  width: max-content;
}

.cell {
  width: 60px;
  height: 60px;
  background-color: white;
  border: 2px solid #333;
  font-size: 32px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

.cell.selected {
  background-color: yellow;
}