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HTML

              
                <body>
	<!-- style was inspired by CARBON => https://www.carbon.now.sh -->
	<div class="carbon">
		<div class="panel">
			<div class="panel__one circle"></div>
			<div class="panel__two circle"></div>
			<div class="panel__three circle">
				<!--<input type="checkbox" class="toggler3"> -->
			</div>
		</div>
		<!-- end of panel -->
		<div class="container">

			<div class="box box1">
				<div class="box backside">
					<i class="far fa-gem"></i>
				</div>
			</div>

			<div class="box box2">
				<div class="box backside">
					<i class="far fa-gem"></i>
				</div>
			</div>

			<div class="box box3">
				<div class="box backside">
					<i class="fas fa-bomb"></i>
				</div>
			</div>

			<div class="box box4">
				<div class="box backside">
					<i class="fas fa-bomb"></i>
				</div>
			</div>

			<div class="box box5">
				<div class="box backside">
					<i class="fas fa-dizzy"></i>
				</div>
			</div>

			<div class="box box6">
				<div class="box backside">
					<i class="fas fa-dizzy"></i>
				</div>
			</div>

			<div class="box box7">
				<div class="box backside">
					<i class="fas fa-cannabis"></i>
				</div>
			</div>

			<div class="box box8">
				<div class="box backside">
					<i class="fas fa-cannabis"></i>
				</div>
			</div>

			<div class="box box9">
				<div class="box backside">
					<i class="fas fa-helicopter"></i>
				</div>
			</div>

			<div class="box box10">
				<div class="box backside">
					<i class="fas fa-helicopter"></i>
				</div>
			</div>

			<div class="box box11">
				<div class="box backside">
					<i class="fas fa-chess"></i>
				</div>
			</div>

			<div class="box box12">
				<div class="box backside">
					<i class="fas fa-chess"></i>
				</div>
			</div>

			<div class="box box13">
				<div class="box backside">
					<i class="fab fa-js-square"></i>
				</div>
			</div>

			<div class="box box14">
				<div class="box backside">
					<i class="fab fa-js-square"></i>
				</div>
			</div>

			<div class="box box15">
				<div class="box backside">
					<i class="fas fa-cocktail"></i>
				</div>
			</div>

			<div class="box box16">
				<div class="box backside">
					<i class="fas fa-cocktail"></i>
				</div>
			</div>

			<div class="box box17">
				<div class="box backside">
					<i class="fas fa-dice"></i>
				</div>
			</div>

			<div class="box box18">
				<div class="box backside">
					<i class="fas fa-dice"></i>
				</div>
			</div>

		</div>
	</div>
	<!-- end of MAIN   -->
	<div class="carbon tabbar">

		<div>
			<span>{</span>
			<h4>
				<span>moves:</span>
				<span class="counter"> 0 </span>,
				<span>time_elapsed:</span>
				<span class="time">00:00</span>
			</h4>
			<span>}</span>

			<button onclick="startGame()">START</button>
		</div>

	</div>
	<!-- <p>by Roektman.com</p> -->
</body>
              
            
!

CSS

              
                * {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  text-transform: capitalize;
  font-family: 'Ubuntu', sans-serif;
  outline: none;
}

body {

  background: -webkit-gradient(linear, left top, right top, from(rgba(4,191,212,0.9)), to(rgba(117,8,161,0.9)));

  background: -webkit-linear-gradient(left, rgba(4,191,212,0.9) 0%, rgba(117,8,161,0.9) 100%);

  background: -o-linear-gradient(left, rgba(4,191,212,0.9) 0%, rgba(117,8,161,0.9) 100%);

  background: linear-gradient(-270deg, rgba(4,191,212,0.9) 0%, rgba(117,8,161,0.9) 100%);
}

body::after {
  content: '';
  background: url('https://svgshare.com/i/7cp.svg');
  opacity: 0.1;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  position: absolute;
  z-index: -1;
}

@-webkit-keyframes rotate {
  from {
    -webkit-transform: rotate(0deg);
  }
  to {
    -webkit-transform: rotate(8deg);
  }
}
.carbon {
  background: #2a334c;
  border-radius: 4px;
  padding: 10px 30px 10px 30px;
  width: 65%;
  height: 85%;
  margin: 60px auto 10px auto;
  -webkit-transition: all 2s ease-out;
  -o-transition: all 2s ease-out;
  transition: all 2s ease-out;
  -webkit-box-shadow: 2px 4px 24px black;
          box-shadow: 2px 4px 24px black;
}

.tabbar {
  height: 50px;
  position: relative;
  color: white;
  padding: 1px;
  font-family: 'Orbitron', sans-serif;
}

.tabbar > div {
  padding-left: 10px;
  position: absolute;
  top: 14px;
  left: 0;
  color: #ff5f56;
  width: 100%;
}

.tabbar > div > span,
h4 {
  display: inline;
}

h4 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 400;
}

h4 > span {
  font-family: 'Orbitron', sans-serif;
  color: #27c93f;
}

.time,
.counter {
  color: #ffbe2e;
  font-size: 25px;
  font-weight: 600;
}

button {
  font-family: 'Orbitron', sans-serif;
  border-radius: 3px;
  background-color: #ff5f56;
  width: 100px;
  height: 30px;
  top: -3px;
  right: 15px;
  position: absolute;
  font-size: 20px;
  color: white;
  -webkit-box-shadow: 2px 2px 2px #ff5f56;
          box-shadow: 2px 2px 2px #ff5f56;
  border: 1px solid rgba(0, 0, 0, 0.342);
}

button:active {
  -webkit-box-shadow: 1px 0px 1px #ff5f56;
          box-shadow: 1px 0px 1px #ff5f56;
  height: 32px;
}

.panel {
  background-color: #282a36;
  padding-left: 10px;
  border-radius: 10px;
  margin: 15px 0;
}
.panel .circle {
  border-radius: 50%;
  display: inline-block;
  height: 15px;
  width: 15px;
}
.panel__one {
  background-color: #ff5f56;
}
.panel__two {
  background-color: #ffbe2e;
}
.panel__three {
  background-color: #27c93f;
  position: relative;
}

.circle:hover {
  opacity: 0.7;
  cursor: pointer;
}

.form {
  background-color: #282a36;
  border-radius: 10px;
  padding: 15px;
  font-size: 10px;
  margin-bottom: 50px;
  -webkit-box-shadow: -1px 7px 25px 0px rgba(0, 0, 0, 0.75);
  box-shadow: -1px 7px 25px 0px rgba(0, 0, 0, 0.75);
}
.box {
  height: 110px;
  width: 107px;
  margin: 6px;
  display: inline-block;
  background: #282a36;
  border-left: 1px solid hsl(220, 100%, 50%);
  border: 5px solid hsl(220, 100%, 50%);
  border-top-left-radius: 20px;
  border-bottom-right-radius: 20px;
  animation: rainbow 5s infinite alternate;
  -ms-animation: rainbow 5s infinite alternate;
  -moz-animation: rainbow 5s infinite alternate;
  -webkit-animation: rainbow 5s infinite alternate;
  -webkit-transition: all 0.7s ease-in-out;
  -o-transition: all 0.7s ease-in-out;
  transition: all 0.7s ease-in-out;
  position: relative;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  cursor: pointer;
  -webkit-box-shadow: 3px 4px 22px 2px black;
          box-shadow: 3px 4px 22px 2px black;
}

@keyframes rainbow {
  0% {
    border-color: hsla(343, 86%, 62%, 0.3);
  }
  100% {
    border-color: hsla(211, 99%, 40%, 0.3);
  }
}

@-webkit-keyframes rainbow {
  0% {
    border-color: hsl(0, 100%, 50%, 0.3);
  }
  100% {
    border-color: hsl(255, 100%, 50%, 0.3);
  }
}

.backside {
  padding: 5px;
  margin: 0;
  -webkit-transform: rotateY(180deg);
          transform: rotateY(180deg);
  background: rgba(117,8,161,.7);
  overflow: hidden;
  position: relative;
  border-top-left-radius: 0px;
  border-bottom-right-radius: 0px;
  border-top-right-radius: 20px;
  border-bottom-left-radius: 20px;
}

.backside > i {
  position: absolute;
  font-size: 55px;
  top: 0;
  left: 0;
  -webkit-transform: translate(27px, 30px);
      -ms-transform: translate(27px, 30px);
          transform: translate(27px, 30px);
  color: snow; 
}
.flipped,
.backside {
  -webkit-transform: rotateY(180deg);
          transform: rotateY(180deg);
  border: none;
}

.matchingcards {
  background: #ffbe2e;
  -webkit-transition: all 1s ease-in-out 1s;
  -o-transition: all 1s ease-in-out 1s;
  transition: all 1s ease-in-out 1s;
}

.matchingcards > i {
	color:black;
}

@media screen and (max-width: 1070px) {
 
  .box{
    height: 80px;
    width: 85px;
    margin: 5px;
    border-width: 2px;
    margin-top:-4px;
  }
/*   *{
    font-size:15px;
  } */
     .backside > i {
      -webkit-transform: translate(16px, 16px);
          -ms-transform: translate(16px, 16px);
              transform: translate(16px, 16px);
  }
}
@media screen and (max-width: 1020px) {
  body {
    background: -webkit-gradient(linear, left top, right top, from(#0ABFBC), to(#FC354C));
    background: -webkit-linear-gradient(left, #0ABFBC, #FC354C);
    background: -o-linear-gradient(left, #0ABFBC, #FC354C);
    background: linear-gradient(to right, #0ABFBC, #FC354C); 
  }
  .box{
      height: 80px;
      width: 75px;
      margin: 5px;
    font-size:5%;
  }
  span {
    font-size: 14px;
  }
   .backside > i {
      -webkit-transform: translate(10px, 16px);
          -ms-transform: translate(10px, 16px);
              transform: translate(10px, 16px);
  }
}
@media screen and (max-width: 760px) {
  body {
     background: -webkit-gradient(linear, left top, right top, from(#f857a6), to(#ff5858));
     background: -webkit-linear-gradient(left, #f857a6, #ff5858);
     background: -o-linear-gradient(left, #f857a6, #ff5858);
     background: linear-gradient(to right, #f857a6, #ff5858); 
  }
  .box{
      height: 70px;
      width: 68px;
      margin: 4px;
  }
  
  .backside > i {
      -webkit-transform: translate(10px, 10px);
          -ms-transform: translate(10px, 10px);
              transform: translate(10px, 10px);
  }
  
    .counter,.time,span {
    font-size: 10px;
  }

}
@media screen and (max-width: 455px) {
  body {
      background: -webkit-gradient(linear, left top, right top, from(#d53369), to(#cbad6d));
      background: -webkit-linear-gradient(left, #d53369, #cbad6d);
      background: -o-linear-gradient(left, #d53369, #cbad6d);
      background: linear-gradient(to right, #d53369, #cbad6d);
   
  }
  .box{
    height: 35px;
    width: 35px;
    margin: 8px;
    font-size: 15px;
  }

  .backside > i {
  font-size: 15px;
    color:white;
  }
  button{
    font-size:7px;
    width:33px;
  }
  .counter,.time {
    font-size: 14px;
  }

}

              
            
!

JS

              
                'use strict';

const cards = {
	box1: 'box2',
	box2: 'box1',
	box3: 'box4',
	box4: 'box3',
	box5: 'box6',
	box6: 'box5',
	box7: 'box8',
	box8: 'box7',
	box9: 'box10',
	box10: 'box9',
	box11: 'box12',
	box12: 'box11',
	box13: 'box14',
	box14: 'box13',
	box15: 'box16',
	box16: 'box15',
	box17: 'box18',
	box18: 'box17'
};

//CARBON == MAIN PANEL !
const carbon = document.querySelector('.carbon');
const time = document.querySelector('.time');
const counter = document.querySelector('.counter');
const circle1 = document.querySelector('.panel__one');
const circle2 = document.querySelector('.panel__two');
const circle3 = document.querySelector('.panel__three');
const container = document.querySelector('.container');
const box = Array.from(document.querySelectorAll('.box'));
const audio = new Audio('https://loudlinks.rocks/sounds/mp3/magic.mp3');

let correct_flips = 0;
let last_flipped = [];
let moves = 0;
let seconds = 0;
let minutes = 0;
let seconds_str = '';
let minutes_str = '';
let timer_observer;

container.innerHTML = '';

function flipOnClick(e) {
	moves++;
	counter.innerHTML = moves;
	const element = e.target;
	last_flipped.push(element);
	element.classList.add('flipped');
	// console.log(last_flipped.length);
	compareFlipped(last_flipped);
}

function compareFlipped(array) {
	if (array.length > 2) {
		array.forEach(el => el.classList.remove('flipped'));
		last_flipped = [];
	}
	if (array.length == 2) {
		const card1 = array[0].classList[1];
		const card2 = array[1].classList[1];
		// console.log(cards[card1], cards[card2]);
		if (cards[card1] == card2 || cards[card2] == card1) {
			// console.log('Yay its a match');
			const c1 = document
				.getElementsByClassName(card1)[0]
				.firstElementChild.classList.add('matchingcards');
			const c2 = document
				.getElementsByClassName(card2)[0]
				.firstElementChild.classList.add('matchingcards');
			correct_flips += 1;
			last_flipped = [];
		} else {
			setTimeout(() => {
				array.forEach(el => el.classList.remove('flipped'));
				last_flipped = [];
			}, 700);
		}
	}
}

function spreadCards(array) {
	let new_Arr = array.filter(el => array.indexOf(el) % 2 == 0);
	while (0 < new_Arr.length) {
		const num = Math.floor(Math.random() * new_Arr.length);
		const pick = new_Arr[num];
		container.appendChild(pick);
		// console.log(container);
		new_Arr.splice(num, 1);
	}
}

function startWatching(seconds, minutes) {
	timer_observer = setInterval(() => {
		seconds > 58 ? ((minutes += 1), (seconds = 0)) : (seconds += 1);
		seconds_str = seconds > 9 ? `${seconds}` : `0${seconds}`;
		minutes_str = minutes > 9 ? `${minutes}` : `0${minutes}`;
		time.innerHTML = `${minutes_str}:${seconds_str}`;
		if (correct_flips >= 9) {
			audio.play();
			clearInterval(timer_observer);
			gameWonParty(moves);
			return;
		}
		// console.log(minutes, seconds_str);
	}, 1000);
}

function startGame() {
	correct_flips = 0;
	last_flipped = [];
	moves = 0;
	seconds = 0;
	minutes = 0;
	seconds_str = '';
	minutes_str = '';
	time.innerHTML = 'XX:XX';
	counter.innerHTML = '0';
	container.innerHTML = '';
	box.forEach(el => el.classList.remove('flipped'));
	clearInterval(timer_observer);
	spreadCards(box);
	container.childNodes.forEach(node =>
		node.firstElementChild.classList.remove('matchingcards')
	);
	startWatching(seconds, minutes);
}

function gameWonParty(moves) {
	// const audio = new Audio('https://loudlinks.rocks/sounds/mp3/magic.mp3');
	audio.play();
	// alert(`You Won with just ${moves} moves !`);
	//NOTE: make a fancy celebration with canvas
}

box.forEach(el => el.addEventListener('click', flipOnClick));

circle1.addEventListener('click', (e) => {
	clearInterval(timer_observer);
	container.innerHTML = '';
	time.innerHTML = 'XX:XX';
	counter.innerHTML = '0';
});

circle2.addEventListener('click', (e) => {
	carbon.style.height = '85%';
	carbon.style.width = '65%';
});
//green circle
circle3.addEventListener('click', (e) => {
	carbon.style.height = '90%';
	carbon.style.width = '90%';
});


              
            
!
999px

Console