body {
  margin: 0;
  font-family: sans-serif;
  text-align: center;
  background-size: cover;
  background-position: center;
  transition: background-image 0.5s;
}

.controls {
  margin: 20px auto;
}

.bg-selector img {
  width: 80px;
  height: 50px;
  margin: 5px;
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 5px;
}

.bg-selector img:hover {
  border-color: #444;
}

.char-option {
  font-size: 24px;
  padding: 10px 20px;
  margin: 5px;
  cursor: pointer;
}

.game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 80px);
  grid-template-rows: repeat(3, 80px);
  gap: 5px;
  margin-top: 20px;
}

.cell {
  background: rgba(255, 255, 255, 0.8);
  border: 2px solid #333;
  font-size: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.winner-message {
  margin-top: 20px;
  font-size: 24px;
  color: #222;
}

@media (max-width: 600px) {
  .board {
    grid-template-columns: repeat(3, 60px);
    grid-template-rows: repeat(3, 60px);
  }

  .char-option {
    font-size: 20px;
  }
}