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HTML 

              
                		<section class="modbg">
			<article class="card-wrapper">
				<p class="logolinkwrap"><a href="http://redonion.se" class="logolink"><img src="http://redonion.se/svg/logo-filled.svg" id="logo_normal" width="69" height="85" alt="logo"><br>Red Onion</a></p>
				<h1>Web Celebrity Memory</h1>

				<p class="score">Pairs found: <span>0</span></p>

				<ul class="deck">
					<li class="endnote"><p>Good Job! :)</p></li>
				</ul>

				<ul class="facit">
				</ul>

			</article>
		</section>
!

CSS 

              
                body{
    margin:0;
    font-family: 'PT serif', serif;
    background-color:#141929;
}

a, a:focus, a:hover, a:active{
    cursor: pointer;
}

a{
  color: #25a8fd;
  text-decoration: none;
}

.modbg{
    display:flex;
    flex-direction:column;
    //overflow-x: hidden;
}

.logolinkwrap{
    text-align:center;
    margin:0 auto 2em;
}

.logolink{
    text-align: center;
    font-style: italic;
    display: inline-block;
}

.logolinkwrap img{
    filter: drop-shadow(0 0 0 #FFF);
    width: 3em;
    height: auto;
}

.card-wrapper{
    color:#000;
    width: 100%;
    margin:auto;
    display: flex;
    flex-direction:column;
    max-width: 83.125em; /*1330px;*/
}

h1{
    color: #fffce9;
    font-weight: normal;
    font-size: 48px;
    font-size: 3rem;
    text-align: center;
    font-style: italic;
    margin:auto;
}

.score{
    color:#fffce9;
    text-align: center;
}

.facit{
    color:#fffce9;
    list-style-type: none;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    padding:0;
    min-height: 6em; /*96px;*/
    margin: 1em 0.5em auto 0.5em;
    overflow:hidden;
}
    .facit li{
        width: 100%;
        margin-bottom: 0.5em;
        animation-duration: 1s;
        animation-delay:1s;
        animation-fill-mode: both;
        animation-name: fadeInUpBig;
    }

    @keyframes fadeInUpBig {
      from {
        opacity: 0;
        transform: translate3d(0, 2000px, 0);
      }

      to {
        opacity: 1;
        transform: none;
      }
    }

    .facit span{
        display: inline-block;
    }

    .facit span::after, .logolink::after{
        content:'';
        width:100%;
        height:1px;
        display: block;
        background-color: #25a8fd;
        opacity: 0;
        position: relative;
        transition: opacity 0.6s, transform 0.6s;
    }

    .facit a:hover span:after,
    .facit a:focus span:after,
    .facit a:active span:after,
    .logolink:hover::after,
    .logolink:focus::after,
    .logolink:active::after{
        opacity:1;
        transform: translateY(2px);
    }

    @media only screen and (min-width: 30em) { /*480*/
        .facit li{
            width:50%;
        }
    }

    @media only screen and (min-width: 48em) { /*768*/
        .facit li{
            width:33.33%;
        }
    }

    @media only screen and (min-width: 83.125) { /*1330px*/
        .facit li{
            width:25%;
        }
    }

    .facit img{
        width: 1.5em;
        height: 1.5em;
        border-radius: 1em;
        float: left;
        margin: 0 0.5em 0 0;
    }
    
.deck{
    list-style-type: none;
    margin:auto;
    padding:0;
    position: relative;    
    text-align: center;
    display: flex;
    flex-direction:row;
    flex-wrap:wrap;
    justify-content: center;
}

    .card{
        background-color:#fffce9;
        box-sizing:border-box;
        border:0.3125em solid #fffce9; /*5px*/
        border-radius:0.5em; /*8px*/
        box-shadow:0 0 1px #000;
        display: inline-block;
        margin:0.5em auto;
        display:flex;
        flex-direction:column;
        margin: 0.5em 0.5em;
        width:8.75em; /*140px;*/
        height: 14.3125em; /*229px;*/
        transition: transform 0.6s, box-shadow 0.6s;
        transform-style: preserve-3d;
    }

    .card:hover{
        cursor: pointer;
    }

    @media only screen and (min-width: 83.125) { /*1330px*/
        .card{
            height: 12.3125em; /*245px;*/
            width:9.375em; /*150px;*/
        }
    }

    .card:hover, .card-flipped{
        box-shadow:0 0 0.75em #ffdfcb;
    }

    .deck img{
        margin:0 auto;
        width:100%;
        height:auto;
    }

    .card-name{
        margin:auto;
        font-size: 18px;
        font-size:1.125rem;        
        font-weight: bold;
    }

    .card-text{
        margin:auto 1em;        
    }

    .deck img.card-text-icon{
        width: 50%;
        margin: auto auto 0 auto;
    }

    .deck img.card-person-icon{
        width: 33%;
        position: absolute;
        top: 50%;
        transform: translateX(-50%);
        left: 50%;
        background-color: #fffce9;
        padding: 0.125em;
        box-sizing: border-box;
        border-radius: 50%;
    }

/*Pair found*/
    .correct{
        visibility: hidden;
    }

    .card.instant-correct{
        background-color:#c6ecc6;
    }

    .pulsate{
        box-shadow: 0 0 16px green;
        animation: pulsate 2s ease-out;
        animation-iteration-count:infinite;
    }

    @keyframes pulsate{
        0% {box-shadow:0 0 2px green;}
        50% {box-shadow: 0 0 16px yellow;}
        100% {box-shadow:0 0 2px green;}
    }

    .card.flipped.slideup{
        transform: rotateY( 180deg ) translate3d(0, -2000px, 0);
        transition: transform 2s, box-shadow 0.6s;
    }

    .card-wrapper{
        transition: transform .3s ease;
        perspective: 6000px;
    }

    .card.flipped{
        transform: rotateY( 180deg );
    }

    .card-front{
        border-radius:0.125em;
        background-color: #fbb;
        background-image:url('http://redonion.se/img/codepen/memory/cardbackground.svg');
        background-size: cover;
        position: absolute;
        display: block;
    }

    .card-front:hover{
        background-color: #ffebeb;
    }

    .card-front, .card-back{
        backface-visibility: hidden;
        width: 100%;
        height:100%;
        display: flex;
        flex-direction:column;
    }

    .card-back{
        transform: rotateY( 180deg );
    }

/*Endnote*/
.endnote{
    position: absolute;
    color: white;
    text-align: center;
    top: 30%;
    display: none;
}

.endnote p{
    margin:0 auto;
    font-size: 78px;
    color: #23a5fa;
}

.endnote-show{
    display: block;
    animation-duration: 1s;
    animation-delay:1.5s;
    animation-fill-mode: both;
    backface-visibility: visible !important;
    animation-name: endnoteshow;
}

@keyframes endnoteshow {
  from {
    transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
    animation-timing-function: ease-in;
    opacity: 0;
  }

  40% {
    transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
    animation-timing-function: ease-in;
  }

  60% {
    transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
    opacity: 1;
  }

  80% {
    transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
  }

  to {
    transform: perspective(400px);
  }
}
!

JS 

              
                $(document).ready(function(){
   
  var cardDeck = [
    //objekt1
    {
      cardname: 'Heydon Pickering',
      cardimg: 'http://redonion.se/img/codepen/memory/ro-memory-pickering.jpg',
      cardicon:'http://redonion.se/img/codepen/memory/owl.svg',
      cardlink:'https://twitter.com/heydonworks',
      cardpair:'0'
    },
    //objekt2
    {
      cardicon:'http://redonion.se/img/codepen/memory/owl.svg',
      cardtext:'lobotomized owl keeper',
      cardpair:'0'
    },
    //objekt3
    {
      cardname: 'Chris Coyier',
      cardimg: 'http://redonion.se/img/codepen/memory/ro-memory-chris.jpg',
      cardicon:'http://redonion.se/img/codepen/memory/codepen.svg',
      cardlink:'https://twitter.com/chriscoyier',
      cardpair:'1'
    },
    //objekt4
    {
      cardicon:'http://redonion.se/img/codepen/memory/codepen.svg',
      cardtext:'shoptalking trickster',
      cardpair:'1'
    },
    //object 5
    {
      cardname: 'Rachel Andrew',
      cardimg: 'http://redonion.se/img/codepen/memory/ro-memory-rachel.jpg',
      cardicon:'http://redonion.se/img/codepen/memory/perch.svg',
      cardlink:'https://twitter.com/rachelandrew',
      cardpair:'2'
    },
    //object 6
    {
      cardicon:'http://redonion.se/img/codepen/memory/perch.svg',
      cardtext:'perching on the grid',
      cardpair:'2'
    },
    //object 7
    {
      cardname: 'Mark Robbins',
      cardimg: 'http://redonion.se/img/codepen/memory/ro-memory-robbins.jpg',
      cardicon:'http://redonion.se/img/codepen/memory/email.svg',
      cardlink:'https://twitter.com/m_j_robbins',
      cardpair:'3'
    },
    //object 8
    {
      cardicon:'http://redonion.se/img/codepen/memory/email.svg',
      cardtext:'(e)mailman',
      cardpair:'3'
    },
    //object 9
    {
      cardname: 'Paul Irish',
      cardimg: 'http://redonion.se/img/codepen/memory/ro-memory-irish.jpeg',
      cardicon:'http://redonion.se/img/codepen/memory/google.svg',
      cardlink:'https://twitter.com/paul_irish',
      cardpair:'4'
    },
    //object 10
    {
      cardicon:'http://redonion.se/img/codepen/memory/google.svg',
      cardtext:'prefers chromed dev tools',//'Google posterboy',
      cardpair:'4'
    },
    //object 11
    {
      cardname: 'Una Kravets',
      cardimg: 'http://redonion.se/img/codepen/memory/ro-memory-una.jpg',
      cardicon:'http://redonion.se/img/codepen/memory/unicorn.svg',
      cardlink:'https://twitter.com/una',
      cardpair:'5'
    },
    //object 12
    {
      cardicon:'http://redonion.se/img/codepen/memory/unicorn.svg',
      cardtext:'talking UI unicorn',
      cardpair:'5'
    },
    //object 13
    {
      cardname: 'Val Head',
      cardimg: 'http://redonion.se/img/codepen/memory/ro-memory-val.jpg',
      cardicon:'http://redonion.se/img/codepen/memory/head.svg',
      cardlink:'https://twitter.com/vlh',
      cardpair:'6'
    },
    //object 14
    {
      cardicon:'http://redonion.se/img/codepen/memory/head.svg',
      cardtext:'animations in style',
      cardpair:'6'
    },
    //object 15
    {
      cardname: 'Brad Frost',
      cardimg: 'http://redonion.se/img/codepen/memory/ro-memory-frost.jpg',
      cardicon:'http://redonion.se/img/codepen/memory/atom.svg',
      cardlink:'https://twitter.com/brad_frost',
      cardpair:'7'
    },
    //object 16
    {
      cardicon:'http://redonion.se/img/codepen/memory/atom.svg',
      cardtext:'makes molecules of designed atoms',
      cardpair:'7'
    }
  ];

var facitDeck = [];

function createfacitDeck(){
  const decklength = cardDeck.length * 0.5;
  for (let i = 0; i < decklength; i++) {
    facitDeck.push({cardpair: i});
  };
}

createfacitDeck();

//Function for creating a random number, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
      // Returns a random integer between min (included) and max (included)
      // Using Math.round() will give you a non-uniform distribution!
      function getRandomIntInclusive(min, max) {
        min = Math.ceil(min);
        max = Math.floor(max);
        return Math.floor(Math.random() * (max - min + 1)) + min;
      }

function dealCards(){
  if(cardDeck.length < 1){
    alert('no more');
  }

  else{
    for (let i = 0; i < 16; i++) {
    const antalObjektMinusEtt = cardDeck.length - 1;
    const myRandomNumber = getRandomIntInclusive(0, antalObjektMinusEtt);

    const tempCardname = cardDeck[myRandomNumber].cardname;
    const tempCardtext = cardDeck[myRandomNumber].cardtext;
    const tempCardimg = cardDeck[myRandomNumber].cardimg;
    const tempCardbackground = cardDeck[myRandomNumber].cardbackground;
    const tempCardpair = cardDeck[myRandomNumber].cardpair;
    const tempCardicon = cardDeck[myRandomNumber].cardicon;
    const tempCardlink = cardDeck[myRandomNumber].cardlink; 
  
    const printCardtext = '<li class="card" data-pairs="' + tempCardpair + '"><div class="card-front"></div><div class="card-back"><img src="' + tempCardicon + '" width="48" height="48" alt="icon" class="card-text-icon"><p class="card-text">' + tempCardtext + '</p></div></li>';
    const printPerson = '<li class="card" data-pairs="' + tempCardpair + '"><div class="card-front"></div><div class="card-back"><img src="' + tempCardimg + '" width="100" height="100" alt="' + tempCardname + '"><img src="' + tempCardicon + '" width="32" height="32" alt="icon" class="card-person-icon"><p class="card-name">' + tempCardname + '</p></div></li>';

    for(let j = 0; j < facitDeck.length; j++){
      if((tempCardpair == facitDeck[j].cardpair) && (tempCardname != undefined)){
        facitDeck[j].cardname = tempCardname;
        facitDeck[j].cardimg = tempCardimg;
        facitDeck[j].cardlink = tempCardlink;
      }
      else if((tempCardpair == facitDeck[j].cardpair) && (tempCardtext != undefined)){
        facitDeck[j].cardtext = tempCardtext;
      }
    }

    if(tempCardname != undefined){
      $('.deck').append(printPerson);
    }

    else if(tempCardtext != undefined){
      $('.deck').append(printCardtext);
    }
  
    //delete
    cardDeck.splice( myRandomNumber, 1 );

    };//for
  }//else
}//dealCards


//return numberofflipped
  function findflipped(){
    let numberofflipped = 0;

    //loopa through all li and check for .flipped
    $('.deck li').each(function(){

      if($(this).hasClass('flipped') == true){
        numberofflipped++;  
      }
    });
    
    return numberofflipped;
  }

  function storepairs(){
    let datapairArray = Array();
    let datapair = '';

    $('.deck li').each(function(){

      if($(this).hasClass('flipped') == true){      
        datapair = $(this).attr('data-pairs');
        datapairArray.push(datapair);
      }

    }); 

    console.log('storepairs ' + datapairArray);
    return datapairArray;
  }

  function compare(){
    const datapairArray = storepairs();

    if(datapairArray[0] != datapairArray[1]){
      return false;
    }

    else{
      return true;
    }
  }

dealCards();

$('.card').on('click', function(){
  if(($(this).hasClass('flipped') != true) || ($(this).hasClass('correct') != true) || ($(this).hasClass('instant-correct') != true)){

    $(this).toggleClass('flipped');
    let numberofflipped = findflipped();

    if(numberofflipped == 2){
      let isitapair = compare();
      
      if(isitapair == true){

        const currentScore = parseInt($('.score span').text(), 10);
        let newScore = currentScore + 1;
        $('.score span').text(newScore);

        //last pair
        if(newScore == 8) {
          $('.endnote').addClass('endnote-show');
        }

        $('.flipped').each(function(){
          let mythis = $(this);

          mythis.addClass('instant-correct');
          mythis.addClass('pulsate');

          setTimeout(function(){ 
            mythis.removeClass('pulsate');            
            mythis.addClass('slideup');
          }, 1000);

          setTimeout(function(){ 
            mythis.addClass('correct');
          }, 2000);

        });//flipped

        //find the pair
        let thispair = $('.flipped').attr("data-pairs");        
        let facitli = '<li><a href="' + facitDeck[thispair]['cardlink'] + '" title="' + facitDeck[thispair]['cardname'] + '"><img src="' + facitDeck[thispair]['cardimg'] + '" width="100" height="100" alt="' + facitDeck[thispair]['cardname'] + '"><span>' + facitDeck[thispair]['cardname'] + '</span></a> - <em>' + facitDeck[thispair]['cardtext'] + '</em></li>';
        $('.facit').append(facitli);
      }
    }//if

    else {
      $('.deck').find('.flipped').removeClass('flipped');
      $(this).toggleClass('flipped');
    }
    }//if
  });//click function

});//end ready
!
999px

Console