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HTML

              
                <header class="header">
        <h1>Matching Game</h1>
        <div class="controls">
            <div class="star-list">
                <i class="fas fa-star star-1 stars"></i>
                <i class="fas fa-star star-2 stars"></i>
                <i class="fas fa-star star-3 stars"></i>
                <span class="moves-container">
                <span class="moves-selector">0</span>
                Moves
                </span>
            </div>
            <div class="time-container">
                <div class="timer"></div>
                <div class="game-start-btn">Star Game</div>
            </div>
            <div class="refresh">
                <i class="fas fa-redo-alt"></i>
            </div>
        </div>
    </header>
    <section class="game-container">
        <ul class="deck">
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
            <li class="card">
                <div class="card-container">
                    <i class="card-face front"></i>
                    <i class="card-face fab back"></i>
                </div>
            </li>
        </ul>
    </section>
    <div class="win">
        <h1>Congratulations!</h1>
        <h3>- You won! -</h3>
        <p>It took you about <span class="seconds">32</span> Seconds to comeplete the game <br> with <span class="moves">17</span> Moves and <span class="star">1</span> Stars.<br>Woooohoooooo!</p>
        <button class="replay">Play again!</button>
    </div>
              
            
!

CSS

              
                @import 'https://fonts.googleapis.com/css?family=Lily+Script+One';
/* general styling */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background: #1E2749;
    font-family: 'Lily Script One', 'helvetica', Arial, sans-serif;
    font-size: 10px;
}

/* header styling */
.header {
    color: #E4D9FF;
    text-align: center;
}

.header h1 {
    margin-top: 3rem;
    font-size: 3rem;
}

.controls {
    margin: 3rem auto 1rem;
    max-width: 600px;
    display: flex;
    justify-content: space-between;
    font-size: 1.15rem;
    font-family: 'helvetica', Arial, sans-serif;
    transition: all 0.3s;
}

.refresh {
    transition: all 0.3s;
}

.refresh:hover {
    color: #273469;
}

.moves-container {
    margin-left: 1rem;
}

.game-start-btn {
    width: 150px;
    border: 1px solid #E4D9FF;
    border-radius: 50px;
    padding: 0.5rem;
    transition: all 0.3s;
}

.game-start-btn:hover {
    background: #E4D9FF;
    color: #1E2749;
    cursor: pointer;
}

.hide-start-btn {
    display: none;
}

/* card ddeck styling */

.deck {
    margin: 3vh auto 0 ;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    max-width: 660px;
    min-height: 600px;
}

.card {
    list-style: none;
    width: 130px;
    height: 130px;
    color: #E4D9FF;
    background: #1E2744;
    margin: 0.5em;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 10px;
    perspective: 500px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    transform-origin: center;
    transition: all 0.5s;
}

.card-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    border-radius: 10px;
    position: relative;
    transition: all 0.5s;
    transform-style: preserve-3d;
}

.card-face {
    position: absolute;
    border-radius: 10px;
    height: 100%;
    width: 100%;
    backface-visibility: hidden;
}

.front {
    background: #273469;
}

.back {
    background: #273469;
    transform: rotateY( 180deg );
}

.fab {
    font-size: 5rem;
    line-height: 1.9;
    text-align: center;
}

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

.cant-click-this {
    pointer-events: none;
}

.wrong {
    animation: wrong 0.25s ease-in-out;
}

@keyframes wrong {
    0% {
        transform: rotate(0);
    } 25% {
         transform: rotate(-15deg);
    } 50% {
         transform: rotate(0);
    } 75% {
        transform: rotate(15deg);
    } 100% {
         transform: rotate(0);
    }
}

.correct {
    animation: correct 0.3s ease-in-out;
}

@keyframes correct {
    0% {
        transform: scaleX(1) scaleY(1);
    } 50% {
        transform: scaleX(1.15) scaleY(1.1);
    } 100% {
        transform: scaleX(1) scaleY(1);
    }
}

/* win section styling */
.win {
    display: none;
    opacity: 0;
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
    background: #FAFAFF;
    text-align: center;
    transition: all 0.3s;
}

.win h1 {
    color: #273469;
    font-size: 3.5rem;
    margin-top: 16rem;
}

.win h3 {
    margin-top: 1rem;
    font-family: 'helvetica', Arial, sans-serif;
    color: #273469;
    font-size: 1.5rem;
    font-weight: 400;
    text-transform: uppercase;
}

.win p {
    margin-top: 1rem;
    font-family: 'helvetica', Arial, sans-serif;
    font-size: 1.25rem;
    line-height: 1.5;
    font-weight: 200;
    color: #aaa;
}

.replay {
    margin-top: 2rem;
    width: 150px;
    padding: 1rem;
    border-radius: 50px;
    background: rgb(126, 149, 230);
    border: none;
    color: #FAFAFF;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.1rem;
    transition: all 0.25s;
    outline: none;
}

.replay:hover {
    background: #273469;
}

.replay:active {
    background: rgb(22, 29, 53);
}

.win-screen {
    display: block;
     opacity: 1;
}

.star, .moves, .seconds {
    font-weight: bold;
}

/* resposivness */
@media  screen and (max-width: 650px) {


  .card {
      width: 120px;
      height: 120px;
      /* margin: 0.3em; */
  }

  .controls {
      width: 500px;
  }
}

@media  screen and (max-width: 525px) {

  .card {
      width: 100px;
      height: 100px;

  }

  .controls {
      width: 500px;
  }
}

@media  screen and (max-width: 450px) {

  .card {
      width: 90px;
      height: 90px;

  }

  .controls {
      width: 400px;
  }
}
              
            
!

JS

              
                let cardsCollected = [];
let DeckOfCards = [];
let cardOneElement, cardTwoElement, startTime;
let seconds = 0;
let currentTurn = 0;
let moves = 0;
let stars = 3;
let gameWon = false;

const deck = document.querySelector('.deck');
const winContainer = document.querySelector('.win');
const btnReplay = document.querySelector('.replay');
const moveHolder = document.querySelector('.moves');
const starHolder = document.querySelector('.star');
const resetButton = document.querySelector('.refresh');
const movesContainer = document.querySelector('.moves-selector');
const starsList = document.querySelectorAll('.stars');
const startBtn = document.querySelector('.game-start-btn');
const timerContainer = document.querySelector('.timer');
const secondsContainer = document.querySelector('.seconds');

const classList = ['fa-html5', 'fa-html5', 'fa-css3-alt', 'fa-css3-alt', 'fa-js-square', 'fa-js-square', 'fa-npm', 'fa-npm', 'fa-react', 'fa-react', 'fa-node-js', 'fa-node-js', 'fa-gulp', 'fa-gulp', 'fa-github', 'fa-github'];
const filteredList = ['fa-html5', 'fa-css3-alt', 'fa-js-square', 'fa-npm', 'fa-react', 'fa-node-js', 'fa-gulp', 'fa-github'];
const halfStar = "fas fa-star-half-alt";
const emptyStar = "far fa-star";
const fullSar = "fas fa-star stars";

// ------------------------
//      The Game
// ------------------------

// start game when clicked
startBtn.addEventListener('click', function(){
    // 1. hide the btn
    this.classList.add('hide-start-btn');
    // 2. start the game
    game();
});

// Part 3: When game completes add option to play again
btnReplay.addEventListener('click', replayTheGame);
resetButton.addEventListener('click', replayTheGame);


// ------------------------
//      Functions
// ------------------------

// game function
function game() {
    // Part 1. Shuffle the cards
    letsShuffleThis();

    // Part 2: set the timer: timer function taken from sltackoverflow: https://stackoverflow.com/a/29972322
    startTime = Date.now();
    setInterval(function () {
        const delta = Date.now() - startTime; // milliseconds elapsed since start
        seconds = (Math.floor(delta / 1000)); // in seconds
        timerContainer.textContent = seconds;
    }, 1000); // update about every second

    // Part 3: add the flipping functionality to the deck of cards
    //  make use of the bubbling of events and attach the listener to the parent
    deck.addEventListener('click', cardClickHandler)
}

// Function to shuffle a list of class names and then attaches them to a card
function letsShuffleThis() {
    // 1. shuffle the list to randomize position
    DeckOfCards = shuffle([...classList]);
    // 2. get a refrence of the icon element to add class font awesome to.
    const icons = document.querySelectorAll('.back');
    // 3. remove any pre-defined classes in them
    icons.forEach(function (el) {
        for (let x = 0; x < filteredList.length; x++) {
            if (el.classList.contains(filteredList[x])) {
                el.classList.remove(filteredList[x]);
            }
        }
    });
    // 4. add the class to the list of classes in the icon element
    for (let i = 0; i < icons.length; i++) {
        icons[i].classList.add(DeckOfCards[i]);
    }
}

// Shuffle function from http://stackoverflow.com/a/2450976
function shuffle(array) {
    var currentIndex = array.length, temporaryValue, randomIndex;

    while (currentIndex !== 0) {
        randomIndex = Math.floor(Math.random() * currentIndex);
        currentIndex -= 1;
        temporaryValue = array[currentIndex];
        array[currentIndex] = array[randomIndex];
        array[randomIndex] = temporaryValue;
    }

    return array;
}

// function to replay the game
function replayTheGame() {
    // hide message again
    hideWin();
    // remove any disabled elements
    document.querySelectorAll('.cant-click-this').forEach(function(el) {
        el.classList.remove('cant-click-this');
    });
    // remove any flipped classes
    document.querySelectorAll('.card-container').forEach(function (el) {
        flipDown(el);
    });
    // reset the variables
    resetGame();

    // reset UI
    resetUI();

    // play again
    game();
}

// function reset start game
function resetGame() {
    // reset the global variables
    cardsCollected = [];
    DeckOfCards = [];
    cardOneElement = null;
    cardTwoElement = null;
    startTime = null;
    currentTurn = 0;
    gameWon = false;
    seconds = 0;
    moves = 0;
    stars = 3;
}

// function that handles the card click event
function cardClickHandler(e) {
    console.log('card clicked')
    const cardIsNotAlreadyChosen = e.target.parentNode != cardOneElement;
    if (!gameWon && e.target.classList.contains('card-face') && cardIsNotAlreadyChosen) {
        checkStats(e.target.parentNode);
        flipUp(e.target.parentNode);
    }
}

// functions to assigning values and check stats
function checkStats(el) {
    // console.log('CARD_1', cardOneElement)
    // console.log('CARD_2', cardTwoElement)
    // assign pointers to elements based on the turn number
    switch (currentTurn) {
        case 0:
            cardOneElement = el;
            currentTurn += 1;
            break;
        case 1:
            cardTwoElement = el;
            break;
    }

    if (cardOneElement && cardTwoElement) {
        disableClick(deck);
        // disable the deck
        setTimeout(function(){
            // re-enable it in a while
            areTheyEqual()
        }, 1000);
    }

}

// function to check their euality and handels the result
function areTheyEqual() {

    // check class list -> to get the value of teh faced down card
    const cardOneValue = cardOneElement.innerHTML.trim();
    const cardTwoValue = cardTwoElement.innerHTML.trim();

    // check if both classes are equal and that the item isn't in the list to begin with
    if (!cardsCollected.includes(cardOneValue) && (cardOneValue === cardTwoValue)) { // if they are equal
        equal(cardOneValue, cardTwoValue);
    } else {
        notEqual();
    }
    // increase move count
    moves += 1;
    starSetter();
    updateUI();

    // reset the round back to zero
    currentTurn = 0;

    // check if all cards flipped open
    if (cardsCollected.length === 16) {
        gameWon = true;
        setTimeout(winMessage, 300);
    }
}

// function to handel what happenes when cards match
function equal(itemOne, itemTwo) {
    // 1. add them to the array of flipped classes
    cardsCollected.push(itemOne, itemTwo);
    // 2. TO DO: add animation UI for correct result
    correct(cardOneElement);
    correct(cardTwoElement);
    // remove class from element
    setTimeout(function () {
        removeCorrect(cardOneElement)
    }, 350);
    setTimeout(function () {
        removeCorrect(cardTwoElement)
    }, 350);
    // 3. disable the element from being clicked
    disableClick(cardOneElement);
    disableClick(cardTwoElement);
    // 4. reset element pointers
    setTimeout(resetElementPointer, 300);
}

// function to handel cards not matching
function notEqual() {
    // 1. TO DO: add animation UI for wrong match
    wrong(cardOneElement);
    wrong(cardTwoElement);
    // 2. flip the card back down
    setTimeout(function () {
        removeWrong(cardOneElement);
        flipDown(cardOneElement);
     }, 250);
    setTimeout(function () {
        removeWrong(cardTwoElement);
        flipDown(cardTwoElement);
    }, 250);
    // 3. reset element pointers
    setTimeout(resetElementPointer, 300);
}

// function to set stars
function starSetter() {
    // moves less than or equal 9 -> 3 stars
    // moves between 10 and 15 -> 2.5 stars
    if (moves >= 10 && moves <= 15) {
        starsList[2].className = halfStar;
        stars = 2.5;
    }
    // moves between 16 and 20 -> 2 stars
    else if (moves >= 16 && moves <= 20) {
        starsList[2].className = emptyStar;
        stars = 2;
    }
    // moves between 21 and 24 -> 1.5 stars
    else if (moves >= 21 && moves <= 24) {
        starsList[1].className = halfStar;
        stars = 1.5;
    }
    // moves between 25 and 28 -> 1 star
    else if (moves >= 25 && moves <= 28) {
        starsList[1].className = emptyStar;
        stars = 1;
    }
    // moves between 29 and more -> 0.5 stars
    else if (moves >= 29) {
        starsList[0].className = halfStar;
        stars = 0.5;
    }
}

// function display win message
function winMessage() {
    // updating the UI for the end screen to display the correct values
    moveHolder.textContent = moves;
    starHolder.textContent = stars;
    secondsContainer.textContent = seconds;

    // add the class that will view the wining screen
    winContainer.classList.add('win-screen');

    // remove event listener
    deck.removeEventListener('click', cardClickHandler);
}

// function hide win message
function hideWin() {
    winContainer.classList.remove('win-screen');
}

// function to flip the card up
function flipUp(element) {
    element.classList.add('flipped');
}

// function to flip the card down
function flipDown(element) {
    element.classList.remove('flipped');
}

// function to add correct animation
function correct(el) {
    el.classList.add('correct');
}

function removeCorrect(el) {
    el.classList.remove('correct');
}

// function to add wrong animation
function wrong(el) {
    el.classList.add('wrong');
}

function removeWrong(el) {
    el.classList.remove('wrong');
}

//  function to disable element from being clicked
function disableClick(el) {
    el.classList.add('cant-click-this');
}

// function to re-enable elements to be clicked
function enableClick(el) {
    console.log('clicks enabled')
    el.classList.remove('cant-click-this');
}

// function update UI
function updateUI() {
    movesContainer.textContent = moves;
}

function resetUI() {
    movesContainer.textContent = moves;
    starsList.forEach(function(el) {
        el.className = fullSar;
    });
    timerContainer.textContent = "";
}

// function to reset the variables that holds a pointer to a DOM element
function resetElementPointer() {
    cardOneElement = null;
    cardTwoElement = null;
    // enable clicks on the deck of cards
    enableClick(deck)
}




              
            
!
999px

Console