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HTML 

              
                <div class="main-container">

	<div class="title-container">

		<div class="startImage">

			<img src="https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/gifs/start_game.gif" alt="Super Mario Bros Start Game GIF">

		</div>

		<div class="main-title">

			<div class="logo">

				<img src="https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/logo.png" alt="Super Mario Bros Title">

			</div>

			<!--<div class="title"> -->

			<h1>SUPER MARIO BROS TIMELINE:</h1>

			<!-- </div> -->

		</div>

		<div class="endImage">

			<img src="https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/group_photo.jpg">

		</div>

	</div>

	<div class="timeline-container">
		<iv class="timeline-slide-container">

			<div class="slide year1985">

				<div class="cover-art"></div>

				<h2>1985</h2>

			</div>

			<div class="slide year1986">

				<div class="cover-art"></div>

				<h2>1986</h2>

			</div>

			<div class="slide year1988-1">

				<div class="cover-art"></div>

				<h2>1988</h2>

			</div>

			<div class="slide year1988-2">

				<div class="cover-art"></div>

				<h2>1988</h2>

			</div>

			<div class="slide year1989">

				<div class="cover-art"></div>

				<h2>1989</h2>

			</div>

			<div class="slide year1992">

				<div class="cover-art"></div>

				<h2>1992</h2>

			</div>

			<div class="slide year1995">

				<div class="cover-art"></div>

				<h2>1995</h2>

			</div>

			<div class="slide year1996">

				<div class="cover-art"></div>

				<h2>1996</h2>

			</div>

			<div class="slide year2002">

				<div class="cover-art"></div>

				<h2>2002</h2>

			</div>

			<div class="slide year2006">

				<div class="cover-art"></div>

				<h2>2006</h2>

			</div>

			<div class="slide year2007">

				<div class="cover-art"></div>

				<h2>2007</h2>

			</div>

			<div class="slide year2009">

				<div class="cover-art"></div>

				<h2>2009</h2>

			</div>

			<div class="slide year2010">

				<div class="cover-art"></div>

				<h2>2010</h2>

			</div>

			<div class="slide year2011">

				<div class="cover-art"></div>

				<h2>2011</h2>

			</div>

			<div class="slide year2012-1">

				<div class="cover-art"></div>

				<h2>2012</h2>

			</div>

			<div class="slide year2012-2">

				<div class="cover-art"></div>

				<h2>2012</h2>

			</div>

			<div class="slide year2013">

				<div class="cover-art"></div>

				<h2>2013</h2>

			</div>

			<div class="slide year2015">

				<div class="cover-art"></div>

				<h2>2015</h2>

			</div>

			<div class="slide year2016">

				<div class="cover-art"></div>

				<h2>2016</h2>

			</div>

			<div class="slide year2017">

				<div class="cover-art"></div>

				<h2>2017</h2>

			</div>

			<div class="slide year2019">

				<div class="cover-art"></div>

				<h2>2019</h2>

			</div>

			<div class="slide year2021">

				<div class="cover-art"></div>

				<h2>2021</h2>

			</div>

	</div>

</div>

</div>
!

CSS 

              
                .main-container,
.title-container,
.main-title,
.timeline-slide-container,
.slide {
	display: flex;
}

.main-container {
	flex-direction: column;

	justify-content: center;

	align-items: center;
}

.main-title {
	flex-direction: column;

	text-align: center;
}

.year1985 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/1985.jpg");
}

.year1985 .cover-art:hover {
	animation: rotateCover1 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year1986 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/lost_levels.png");
}

.year1986 .cover-art:hover {
	animation: rotateCoverLost 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year1988-1 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario2.png");
}

.year1988-1 .cover-art:hover {
	animation: rotateCover2 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year1988-2 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario3.png");
}

.year1988-2 .cover-art:hover {
	animation: rotateCover3 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year1989 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_land.png");
}

.year1989 .cover-art:hover {
	animation: rotateCoverLand 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year1992 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_land6.jpg");
}

.year1992 .cover-art:hover {
	animation: rotateCoverLand2 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year1995 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_world_2.jpg");
}

.year1995 .cover-art:hover {
	animation: rotateCoverYoshi 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year1996 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_64.png");
}

.year1996 .cover-art:hover {
	animation: rotateCoverSuperMario64 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2002 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_sunshine.png");
}

.year2002 .cover-art:hover {
	animation: rotateCoverSunshine 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2006 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/new_super_mario_bros.png");
}

.year2006 .cover-art:hover {
	animation: rotateCoverNewDS 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2007 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_galaxy.jpg");
}

.year2007 .cover-art:hover {
	animation: rotateCoverGalaxy 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2009 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_bros_wii.jpg");
}

.year2009 .cover-art:hover {
	animation: rotateCoverNewWii 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2010 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_galaxy2.png");
}

.year2010 .cover-art:hover {
	animation: rotateCoverGalaxy2 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2011 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_3d_land.png");
}

.year2011 .cover-art:hover {
	animation: rotateCover3DLand 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2012-1 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/new_super_mario_bros2.jpg");
}

.year2012-1 .cover-art:hover {
	animation: rotateCoverNew2 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2012-2 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_u.png");
}

.year2012-2 .cover-art:hover {
	animation: rotateCoverSuperMarioU 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2013 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_3d_world.png");
}

.year2013 .cover-art:hover {
	animation: rotateCover3DWorld 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2015 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_maker.jpg");
}

.year2016 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_run.png");
}

.year2017 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_odyssey.jpg");
}

.year2017 .cover-art:hover {
	animation: rotateCoverOdyssey 1.5s linear 1;
	animation-fill-mode: forwards;
}

.year2019 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_maker2.jpg");
}

.year2021 .cover-art {
	background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_bowsers_fury.jpg");
}

.year2021 .cover-art:hover {
	animation: rotateCoverBowsersFury 1.5s linear 1;
	animation-fill-mode: forwards;
}

/* 320px */
@media screen and (min-width: 320px) {
	.title-container,
	.timeline-slide-container {
		flex-direction: column;

		width: 90vw;
	}

	.title-container {
		margin-bottom: 2%;
	}

	. .startImage,
	.endImage {
		display: none;
	}

	.startImage img,
	.endImage img {
		width: 0;
	}

	.logo img {
		width: 50%;
	}

	h1,
	h2 {
		font-size: 0.8em;
	}

	.timeline-container {
		overflow-x: hidden;

		overflow-y: hidden;
	}

	.timeLine-slide-container {
		width: 90%;
	}

	.slide {
		flex-direction: column;

		height: 100vh;

		justify-content: center;

		text-align: center;
	}

	.cover-art {
		width: 100%;
		height: 100%;

		background-size: 180px;
		background-repeat: no-repeat;
		background-position: center;

		margin-top: 0.75%;
	}
}

/*640px */

@media screen and (min-width: 640px) {
	h1,
	h2 {
		font-size: 1.5em;
	}
}

/* 1200px */
@media screen and (min-width: 1200px) {
	.title-container {
		flex-direction: row;

		width: 90vw;
		height: 39vh;

		margin-bottom: 1%;
	}

	.startImage,
	.main-title,
	.endImage {
		width: 33.33%;
		height: 100%;
	}

	.main-title {
		flex-direction: column;
	}

	.startImage,
	.endImage {
		text-align: center;
	}

	.startImage img {
		width: 35%;
	}

	.logo {
		width: 100%;
		height: 100%;
	}

	.logo img {
		width: 30%;
	}

	h1 {
		margin-top: 1%;

		font-size: 1em;
	}

	.endImage img {
		width: 25%;
	}

	.timeline-container {
		width: 80vw;
		height: 50vh;

		overflow-x: scroll;

		overflow-y: hidden;

		box-shadow: 10px 10px 10px;
	}

	.timeline-slide-container {
		flex-direction: row;

		width: 575vw;
		height: 105%;
	}

	.slide {
		flex-direction: column;

		width: 10%;
		height: 100%;
	}

	.slide h2 {
		text-align: center;
	}

	.cover-art {
		width: 100%;
		height: 100%;

		background-position: center;
		background-repeat: no-repeat;
	}
}

@media screen and (min-width: 1600px) {
	h1,
	h2 {
		font-size: 1.75em;
	}

	.title-container {
		height: 28vh;

		margin-bottom: 0.5%;
	}

	.startImage img {
		width: 30%;
	}

	.endImage img {
		width: 25%;
	}

	.timeline-container {
		height: 68vh;
	}

	.cover-art {
		background-size: 250px;

		margin-bottom: -10%;
	}
}

@keyframes rotateCover1 {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/1985.jpg");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_bros_NES.gif");
	}
}

@keyframes rotateCover2 {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario2.png");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_bros2_NES.gif");
	}
}

@keyframes rotateCover3 {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario3.png");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_bros3_NES.gif");
	}
}

@keyframes rotateCoverLost {
	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/lost_levels2.png");
	}
}

@keyframes rotateCoverLand {
	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_land_gif.gif");
	}
}

@keyframes rotateCoverLand2 {
	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/land2GIF.gif");
	}
}

@keyframes rotateCoverYoshi {
	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/yoshis_island.gif");
	}
}

@keyframes rotateCoverSuperMario64 {
	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_64.gif");
	}
}

@keyframes rotateCoverSunshine {
	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/sunshine.gif");
	}
}

@keyframes rotateCoverNewDS {
	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/new_super_mario_bros_ds.gif");
	}
}

@keyframes rotateCoverGalaxy {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_sunshine.png");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/galaxy.gif");
	}
}

@keyframes rotateCoverNewWii {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_bros_wii.jpg");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/new_super_mario_bros_wii.gif");
	}
}

@keyframes rotateCoverGalaxy2 {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_galaxy2.png");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/galaxy2.gif");
	}
}

@keyframes rotateCover3DLand {
	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_3DLand.gif");
	}
}

@keyframes rotateCoverNew2 {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/new_super_mario_bros2.jpg");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/new_super_mario_bros2.gif");
	}
}

@keyframes rotateCoverSuperMarioU {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_u.png");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_u.gif");
	}
}

@keyframes rotateCover3DWorld {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_3d_world.png");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_3DWorld.gif");
	}
}

@keyframes rotateCoverOdyssey {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_odyssey.jpg");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/odyssey.gif");
	}
}

@keyframes rotateCoverBowsersFury {
	50% {
		transform: rotateY(90deg);
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/super_mario_bowsers_fury.jpg");
	}

	100% {
		background-image: url("https://adevelopersprofile.com/CodePen/Challenges/MarioTimeline/bowsers_fury.gif");
	}
}
!

JS 

              
                // Horiztonal scrolling

let container = document.querySelector(".timeline-container");

window.addEventListener("wheel", function (e) {
	if (e.deltaY > 0) {
		container.scrollLeft += 100;
	} else {
		container.scrollLeft -= 100;
	}
});
!
999px

Console