body {
  font-family: Arial, sans-serif;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-gap: 10px;
  margin-top: 20px;
}

.board__cell {
  width: 100px;
  height: 100px;
  border: 2px solid #333;
  font-size: 24px;
  cursor: pointer;
  text-align: center;
}

.board__cell:hover {
  background: #ddd;
}

.player-turn {
  margin-top: 20px;
}

.restart-button {
  margin-top: 20px;
  font-size: 16px;
  padding: 10px 20px;
  cursor: pointer;
}

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
  text-align: center;
}

.modal-overlay_shown {
  display: block;
}

.modal-content {
  background: #fff;
  padding: 20px;
  border-radius: 5px;
}