index-2.html

    …
    <div class="above-game">
      <p class="game-intro">Join the numbers and get to the <strong>2048 tile!</strong></p>
      <a class="restart-button">New Game</a>
    </div>
    
    <!-- Add these two divs -->
    <div class="message-container waiting-message" style="display: none;">
      Waiting for Player 2...
    </div>
    <div class="message-container countdown-message" style="display: none;">
      Game starting in <span class="countdown-number"></span>...
    </div>

    <div id="player-one">
      <div class="game-container">
        <div class="game-message">
        ...