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HTML

              
                <!--Container-->
<div id="container">
  <!--Row-->
  <div class='row'>
    <span id="music-control" class="btn btn-danger">
      <i id='music-icon' class="fa fa-volume-up" aria-hidden="true"></i>
      <span id="sound-tooltip"class='tooltip'>Toggle Sound</span>
     </span>
    <h1>Star Wars</h1>
    <h3>Tic-Tac-Toe</h3>
    <span id="reset" class="btn btn-primary">
      Reset
      <span id="sound-tooltip"class='tooltip'>Reset Game</span>
    </span>
  </div>
  <!--End Row-->

  <!--Row-->
  <div class='row'>

    <!--Wrapper-->
    <div id='wrapper'>
      <!--Game Board-->
      <div id='board'>
        <div class='box'></div>
        <div class='box'></div>
        <div class='box'></div>
        <div class='box'></div>
        <div class='box'></div>
        <div class='box'></div>
        <div class='box'></div>
        <div class='box'></div>
        <div class='box'></div>
      </div>
      <!--End Game Board-->
    </div>
    <!--End Wrapper-->
  </div>
  <!--End Row-->

  <!-- Music theme song -->
  <audio id="theme-song">
    <source src='http://www.digitpress.com/dpsoundz/mp3/dp_starwars.mp3'>
  </audio>
  <audio id="darkside-audio">
    <source src="http://www.digitpress.com/dpsoundz/mp3/dp_starwars_darkside.mp3">
  </audio>
  <audio id="lightside-audio">
    <source src="http://www.digitpress.com/dpsoundz/mp3/dp_starwars_theme.mp3">
  </audio>
  <!-- End Music theme song -->
  
</div>
<!--End Container-->


<!-- Modals -->
<div id="overlay"></div>
<div id="modal">
  <span id="close-modal"><i class="fa fa-times" aria-hidden="true"></i>
  </span>
</div>
              
            
!

CSS

              
                // VARIABLES
@bg-image : 'https://mnmlwalls.files.wordpress.com/2015/01/star-wars.png';
@primary-color : #607d8b;
@danger-color: #f44336;
@light-gray: #d3d3d3;
@yellow: #ffc107;
@orange: #FF9800;
@black: #111;
@no-color: rgba(0, 0, 0, 0);
@box-bg-color: rgba(95, 108, 116, 0.44);
@box-hover-color: rgba(227, 227, 227, 0.5);
@overlay-color: rgba(0, 0, 0, 0.35);

// GENERAL
body {
  font-family: 'Roboto', sans-serif;
  background: #302f2f;
  color: white;
  .row {
    width: 100%;
    &:after {
      content: "";
      display: table;
      clear: both;
    }
  }
  .btn {
    width: 75px;
    padding: 5px;
    transition: all .25s ease-in-out;
    border: 2px solid @no-color;
    &:hover {
      background: none;
      border: 2px solid @light-gray;
      color: @light-gray;
    }
  }
  .btn-primary {
    background: @primary-color;
  }
  .btn-danger {
    background: @danger-color ;
  }
}

// MAIN CONTENT
#container {
  width: 960px; 
  margin: 0 auto;
  text-align: center;
  position: relative;
  h1, h3 {
    text-transform: uppercase;
    color: @yellow;
    margin: 10px 0 0 0;
  }
  h3 {
    margin-bottom: 10px
  }
  #reset, #music-control {
    position: absolute;
    top: 0;
    .tooltip{
      position: absolute;
      top: 35px;
      left: 5px;
      border-radius: 5px;
      background: @light-gray;
      color: @black;
      font-size: .75em;
      font-weight: bold;
      padding: 5px;
      opacity: 0;
      transition: all .25s ease-in-out;
      &:after {
        content: " ";
        position: absolute;
        left: 50%;
        bottom: 100%;
        border-style: solid;
        border-width: 5px;
        margin-left: -5px;
        border-color: transparent transparent @light-gray transparent;
      }
    }
    &:hover .tooltip{
      opacity: 1;
    }
  }
  #reset {
    right: 25%;
  }
  #music-control {
    left: 25%;
  }
}


// GAME BOARD
#board {
  background: url(@bg-image) no-repeat center center;
  background-size: cover;
  width: 500px;
  height: 500px;
  margin: 0 auto;
  .box {
    background-color: @box-bg-color;
    margin: 5px;
    height: 155px;
    width: 155px;
    float: left;
    vertical-align: top;
    text-align: center;
    transition: all .25s ease-in-out;
    &:hover {
      background: @box-hover-color;
      transform: scale(1.1);
    }
    img {
      width: 100%;
    }
  }
  #luke-img img,
  #vader-img img {
    width: 25%;
  }
}


// MODAL MESSAGE
#overlay {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  background: @overlay-color;
  display: none;
}

#modal {
  width: 25%;
  position: absolute;
  top: 15%;
  left: 0;
  right: 0;
  margin: 0 auto;
  background: @orange;
  box-shadow: 5px 5px 5px @black;
  text-align: center;
  display: none;
  padding: 50px;
  #close-modal {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 1.25em;
    border: 2px solid white;
    border-radius: 100%;
    height: 25px;
    width: 25px;
    transition: all .25s ease-in-out;
    &:hover{
      transform: scale(1.2);
    }
  }
}
              
            
!

JS

              
                // VARIABLES
// =========================
var playerTurn = 0;
var luke = '<img src="http://icons.iconarchive.com/icons/creativeflip/starwars-longshadow-flat/128/Luke-Skywalker-icon.png">';
var vader = '<img src="http://icons.iconarchive.com/icons/creativeflip/starwars-longshadow-flat/128/Darth-Vader-icon.png">';
var boxes = document.getElementsByClassName('box');
var resetBtn = document.getElementById('reset');
var musicBtn = document.getElementById('music-control');
var musicIcon = document.getElementById('music-icon');
var closeModalBtn = document.getElementById('close-modal');
var overlay = document.getElementById("overlay");
var modal = document.getElementById("modal");
var themeSong = document.getElementById('theme-song');
var darkSideClip = document.getElementById('darkside-audio');
var lightSideClip = document.getElementById('lightside-audio');
var soundOn = true;
// modal messages
var modalMessage = {
  box_occupied: "Sorry, Pick another Square",
  vader_wins: "Now you know the power of the dark side<br> - Vader wins",
  luke_wins: "The force is strong with this one<br> - Luke wins"
}

// EVENT LISTENERS
// =========================
//Attach an Event Listener to each box
for(var i = 0; i < boxes.length; i++ ){
  boxes[i].addEventListener('click', setPlayerTurn);
}
// Event Listener to reset the board
resetBtn.addEventListener('click', resetBoard);
//Event Listener to close the modal 
closeModalBtn.addEventListener('click', closeModal);

// Event Listener to play music
musicBtn.addEventListener('click', function (){  
  
  if(soundOn === true) {
    soundOn = false;
    musicIcon.className = "fa fa-volume-off"
  }else if (soundOn === false) {
    soundOn = true;
    musicIcon.className = "fa fa-volume-up"
  }
  
})


// GAME FUNCTIONS
// =========================
// Setting player turn on each click
function setPlayerTurn(){
  // first check if box is unoccupied
  if(this.innerHTML !== ''){
    openModal(modalMessage.box_occupied);
  // if turn is even number set the box as luke 
  }else if(playerTurn % 2 == 0){
    playerTurn += 1;
    this.innerHTML = luke;
    getWinner();
  // if it's odd, then set the box as vader
  }else {
    playerTurn += 1;
    this.innerHTML = vader;
    getWinner();
  }
}

function getWinner(){
  //Luke Wins Across
  if(boxes[0].innerHTML === luke && boxes[1].innerHTML === luke && boxes[2].innerHTML === luke){
    openMessageAndPlayMusic(modalMessage.luke_wins, lightSideClip);
  }else if(boxes[3].innerHTML === luke && boxes[4].innerHTML  === luke && boxes[5].innerHTML === luke){
    openMessageAndPlayMusic(modalMessage.luke_wins, lightSideClip);
  }else if(boxes[6].innerHTML  === luke && boxes[7].innerHTML  === luke && boxes[8].innerHTML === luke){
    openMessageAndPlayMusic(modalMessage.luke_wins, lightSideClip);
  }
   //Luke Wins Down
   else if(boxes[0].innerHTML  === luke && boxes[3].innerHTML  === luke && boxes[6].innerHTML === luke){
    openMessageAndPlayMusic(modalMessage.luke_wins, lightSideClip);
  }else if(boxes[1].innerHTML === luke && boxes[4].innerHTML === luke && boxes[7].innerHTML === luke){
    openMessageAndPlayMusic(modalMessage.luke_wins, lightSideClip);
  }else if(boxes[2].innerHTML === luke && boxes[5].innerHTML === luke && boxes[8].innerHTML === luke){
    openMessageAndPlayMusic(modalMessage.luke_wins, lightSideClip);
  }
  //Luke Wins Diagonal
   else if(boxes[0].innerHTML === luke && boxes[4].innerHTML === luke && boxes[8].innerHTML === luke){
    openMessageAndPlayMusic(modalMessage.luke_wins, lightSideClip);
  }else if(boxes[6].innerHTML === luke && boxes[4].innerHTML === luke && boxes[2].innerHTML === luke){
    openMessageAndPlayMusic(modalMessage.luke_wins, lightSideClip);
  }
  
  //Vader Wins Across
   else if(boxes[0].innerHTML === vader && boxes[1].innerHTML === vader && boxes[2].innerHTML === vader){
    openMessageAndPlayMusic(modalMessage.vader_wins, darkSideClip);
  }else if(boxes[3].innerHTML === vader && boxes[4].innerHTML  === vader && boxes[5].innerHTML === vader){
    openMessageAndPlayMusic(modalMessage.vader_wins, darkSideClip);
  }else if(boxes[6].innerHTML  === vader && boxes[7].innerHTML  === vader && boxes[8].innerHTML === vader){
    openMessageAndPlayMusic(modalMessage.vader_wins, darkSideClip);
  }
  
   //Vader Wins Down
   else if(boxes[0].innerHTML  === vader && boxes[3].innerHTML  === vader && boxes[6].innerHTML === vader){
    openMessageAndPlayMusic(modalMessage.vader_wins, darkSideClip);
  }else if(boxes[1].innerHTML === vader && boxes[4].innerHTML === vader && boxes[7].innerHTML === vader){
    openMessageAndPlayMusic(modalMessage.vader_wins, darkSideClip);
  }else if(boxes[2].innerHTML === vader && boxes[5].innerHTML === vader && boxes[8].innerHTML === vader){
    openMessageAndPlayMusic(modalMessage.vader_wins, darkSideClip);
  }
  
   //Vader Wins Diagonal
   else if(boxes[0].innerHTML === vader && boxes[4].innerHTML === vader && boxes[8].innerHTML === vader){
    openMessageAndPlayMusic(modalMessage.vader_wins, darkSideClip);
  }else if(boxes[6].innerHTML === vader && boxes[4].innerHTML === vader && boxes[2].innerHTML === vader){
    openMessageAndPlayMusic(modalMessage.vader_wins, darkSideClip);
  }
  
}


// function to reset board
function resetBoard(){
  for(var i = 0; i < boxes.length; i++){
    boxes[i].innerHTML = '';
  }
  playerTurn = 0;
}


// function when either luke or vader wins
function openMessageAndPlayMusic(player,song){
  // open messsage 
  openModal(player);
  
  // play song if sound is on
  function playSong(){
    if(soundOn === true){
      song.play();
    }
  }
  
  // invoke song function
  return playSong(song);
}


// Open modal and set message
function openModal(message){
  var h2 = document.createElement("h2");
  overlay.style.display = 'block';
  modal.style.display = 'block';
  
  h2.innerHTML = message;
  h2.id = "message";
  modal.appendChild(h2)
  
}

// Close the modal
function closeModal(){
  overlay.style.display = "none";
  modal.style.display = "none";
  // remove the previous message
  if(modal.children[1]){
    modal.removeChild(modal.children[1]);
  }
}





              
            
!
999px

Console