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HTML

              
                <html>
<head>
  <meta charset="utf-8">
  <title>Memory Game</title>
  <link rel="stylesheet" href="css/app.css"/>
      <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css"/>
</head>
<body>
   <nav class="navbar navbar-inverse navbar-fixed-top">
   <div class="container-fluid">
     <div class="navbar-header">
       <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span> 
      </button>
       <a class="navbar-brand href="#top"" id="top"> Dean</a>
     </div>
       
     <ul class="nav navbar-nav navbar-right">
       <li class="activate"> <a href="index.html"> ABOUT </a> </li>
       <li> <a href="#top"> CARDS GAME </a> </li>
       <li><a href="index.html"> CONTACT</a></li> </ul>
       </div>
     </nav>
  <!--Main grid-->
  <br><br>
    <header class="box">
        <img src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064622/logo_jbdzfk.png" class="logo" />
        <h1>Memory Monsters</h1>
        <h2>Where we <span class="niceText">Scare</span> people Off
   <button id="foo" type="button" class="btn" onclick="shuffle();">
          Restart Game!</button>
 <button type="button" value="click" class="btn" onclick="shuffle();">Shuffle</button></div> 
          </h2>
    </header>
    <div class="board" id="main">
      
        <div class="card" data-card="1" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064604/1_plrmj0.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="2" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064604/2_bykxuj.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="1" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064604/1_plrmj0.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="2" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064604/2_bykxuj.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="3" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064604/3_wgtknx.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="4" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064602/4_jg6e9r.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="3" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064604/3_wgtknx.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="4" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064602/4_jg6e9r.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="5" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064602/5_ttd5mn.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="6" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/6_yk8qwj.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="5" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064602/5_ttd5mn.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>
        <div class="card" data-card="6" onclick="cardClicked(this)">
            <img class="front" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/6_yk8qwj.png">
            <img class="back" src="https://res.cloudinary.com/dy4voxduv/image/upload/v1468064603/back_e4mcye.png" >
        </div>

    </div>


  <script src="js/app.js"></script>
 
</body>
</html>

              
            
!

CSS

              
                header {
    background-color: black;
    padding:10px;
    margin-bottom: 0px;
}
.navbar {
  position: realtive;
  margin-bottom: 200px;
}

h1 {
    color: white !important;
    font-size: 4em;
}
h2 {
    color: white !important;
}

.niceText {
    font-style: italic;
    color:lightgreen;
}

.btn {
 display: flex; 
justify-content: center;
margin-left: 100px;
color: black;
}
.logo {
position: absolute;
width: 130x;
height: 130px;
right: 20px;
z-index:999;
}



.card {
    width:170px;
    height:192px;
    float:left;
    margin: 10px;
}

.card img {
    position: absolute;
}

.card.flipped .back{
    display:none;
}

#main:after {
  content: "";
  display: table;
  clear: both;
}
#main {
   margin-top: 0px;
   background-color: lightgray;
}
.front {
  width: 140px;
}

              
            
!

JS

              
                // Those are global variables, they stay alive and reflect the state of the game
var elPreviousCard = null;
var flippedCouplesCount = 0;
var cards_testing = 0;

// This is a constant that we dont change during the game (we mark those with CAPITAL letters)
var TOTAL_COUPLES_COUNT = 6;

// Load an audio file win + right + wrong
var audioWin = new Audio('sound/win.mp3');

var audioRight = new Audio('sound/right.mp3');

var audioWrong = new Audio('sound/wrong.mp3');

// shuffle + reset game  flipped cards off
function shuffle(){
  // select all cards and runs loop to shuffle the order
var board = document.querySelector('.board');
for (var i = board.children.length; i >= 0; i--) {
board.appendChild(board.children[Math.random() * i | 0]);

    // Get all DOM object with class "flipped". as its what was used for displaying "hidden" image.
    var flipped_cards = document.getElementsByClassName('flipped');
    // Loops through all flipped_cards and flip them back by toggling class "flipped" off
    // already initialized i in this function block. So no need for var i.
    for(i = 0; i < flipped_cards.length; i++){
        // classList.toggle. adds class if element does not have it and removes it if elements have it.
        flipped_cards[i].classList.toggle('flipped');
    }
  }
}
// This function is called whenever the user click a card
function cardClicked(elCard) {
  // main scope, Only 2 card can be visible at same time.
if(cards_testing < 2){
    // This card will be visible. So one more card visible in counter.
    cards_testing++;
  
    // If the user clicked an already flipped card - do nothing and return from the function
    if (elCard.classList.contains('flipped')) {
        return;
    }

    // Flip it
    elCard.classList.add('flipped');

    // This is a first card, only keep it in the global variable
    if (elPreviousCard === null) {
        elPreviousCard = elCard;
    } else {
        // get the data-card attribute's value from both cards
        var card1 = elPreviousCard.getAttribute('data-card');
        var card2 = elCard.getAttribute('data-card');

        // No match, schedule to flip them back in 1 second
        if (card1 !== card2){
            setTimeout(function () {
              // Hides this card again. So now two less card visible in counter.
                cards_testing -= 2;
                elCard.classList.remove('flipped');
                elPreviousCard.classList.remove('flipped');
                elPreviousCard = null;
            }, 1000)
            // Play music for a mistake
            AudioWrong.play();
        } 
      else {
            // Yes! a match!
          // Both card were correct. No need to hide both. Reset testing counter.
          cards_testing = 0;
          flippedCouplesCount++;
          elPreviousCard = null;
          audioRight.play();

            // All cards flipped!
            if (TOTAL_COUPLES_COUNT === flippedCouplesCount) {
                audioWin.play();
            
             }
  
         }

      }
  }

}

              
            
!
999px

Console