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CSS

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HTML 

              
                <h1>
	<img src="https://upload.wikimedia.org/wikipedia/commons/0/05/Mario_Series_Logo.svg" alt="Super Mario Timeline" />
	<p class="header">Timeline</p>
	<p class="description">Initial launch dates of games in the Super Mario series. </p>
</h1>

<ul class="timeline">
	<div class="cloud cloud1"></div>
	<div class="cloud cloud2"></div>
	<div class="cloud cloud3"></div>
	<div class="cloud-s cloud-s1"></div>
	<div class="cloud-s cloud-s2"></div>
	<div class="cloud-s cloud-s3"></div>
	<div class="cloud-s cloud-s4"></div>
	<div class="cloud-s cloud-s5"></div>
	<div class="cloud-s cloud-s6"></div>
	<div class="hill hill1"></div>
	<div class="hill hill2"></div>
	<div class="hill hill3"></div>
	<div class="hill hill4"></div>
	<div class="bush bush1"></div>
	<div class="bush bush2"></div>
	<div class="bush bush3"></div>
	<div class="bush bush4"></div>
	<div class="pipe pipe1"></div>
	<div class="pipe pipe2"></div>
	<div class="pipe pipe3"></div>
	<div class="goal"></div>
	<div class="castle"></div>
	<div class="mario"></div>
	<li class="click"><a></a>
		<div class="overlay"><time datetime="1985-09">September 1985</time>
			<p>Super Mario Brothers</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="1986-06">June 1986</time>
			<p>Super Mario Bros: The Lost Levels</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="1988-10">October 1988</time>
			<p>Super Mario Bros. 2</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="1988-10">October 1988</time>
			<p>Super Mario Bros. 3</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="1989-04">April 1989</time>
			<p>Super Mario Land</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="1990-11">November 1990</time>
			<p>Super Mario World</p>
		</div>
	</li>
	<li>
		<div class="coin"></div>
		<a></a>
		<div class="overlay"><time datetime="1992-10">October 1992</time>
			<p>Super Mario Land: 6 Golden Coins</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="1995-08">August 1995</time>
			<p>Super Mario World 2: Yoshi's Island</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="1996-06">June 1996</time>
			<p>Super Mario 64</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2002-07">July 2002</time>
			<p>Super Mario Sunshine</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2006-05">May 2006</time>
			<p>New Super Mario Bros.</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2007-11">November 2007</time>
			<p>Super Mario Galaxy</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2009-11">November 2009</time>
			<p>New Super Mario Bros. Wii</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2010-05">May 2010</time>
			<p>Super Mario Galaxy 2</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2011-11">November 2011</time>
			<p>Super Mario 3D Land</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2012-07">July 2012</time>
			<p>New Super Mario Bros 2</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2012-11">November 2012</time>
			<p>New Super Mario Bros. U</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2013-11">November 2013</time>
			<p>Super Mario 3D World</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2015-09">September 2015</time>
			<p>Super Mario Maker</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2016-12">December 2016</time>
			<p>Super Mario Run</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2017-10">October 2017</time>
			<p>Super Mario Odyssey</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2019-06">June 2019</time>
			<p>Super Mario Maker 2</p>
		</div>
	</li>
	<li><a></a>
		<div class="overlay"><time datetime="2021-02">February 2021</time>
			<p>Super Mario 3D World + Bowser's Fury</p>
		</div>
	</li>
</ul>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Press+Start+2P&family=Montserrat&display=swap");

$onyx: rgba(57, 62, 65, 1);
$timberwolf: rgba(211, 208, 203, 1);

body,
html {
	margin: 0;
	padding: 0;
	background: rgb(149, 237, 255);
	background: linear-gradient(
		0deg,
		rgba(149, 237, 255, 1) 0%,
		rgba(31, 151, 254, 1) 100%
	);
	color: $onyx;
	width: calc(100% - 2em);
	font-family: "Montserrat", sans-serif;
	display: flex;
	flex-flow: column;
	min-height: 80vh;
	transition: 1s;
}

h1 {
	position: fixed;
	text-align: center;
	width: 100%;
	img {
		width: 50vh;
	}

	.header {
		font-family: "Press Start 2P", cursive;
		text-transform: uppercase;
		font-size: 1.2em;
		margin: 0;
		padding: 0;
		color: white;
		text-shadow: 0.1em 0.1em red;
		width: 100%;
	}

	.description {
		font-family: "Press Start 2P", cursive;
		font-size: 0.25em;
		text-align: center;
		width: 50%;
		margin: 1em auto;
		line-height: 1.5em;
	}
}

ul {
	width: auto;
	white-space: nowrap;
	margin: 0;
	padding: 0;
	list-style: none;
	position: absolute;
	bottom: 20vh;
	margin-left: 80vw;
	padding-right: 50vw;
}

ul:before {
	content: "";
	position: fixed;
	bottom: 0;
	left: 0;
	width: 100%;
	height: 20vh;
	background-image: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/a0d4f96a4aa2122.png);
	background-size: 2em;
}

ul li.click:not(.active):not(.visited):before {
	content: "click \A \25BC";
	display: block;
	position: absolute;
	top: -3em;
	white-space: pre-wrap;
	text-align: center;
	font-family: "Press Start 2P", cursive;
	font-size: 0.7em;
	font-weight: bold;
	left: calc(0px - 1em);
	width: 5em;
	opacity: 0.5;
	animation: click 1s ease-in-out 0s infinite normal forwards;
}

@keyframes click {
	0%,
	100% {
		transform: translateY(-0.3em);
	}

	50% {
		transform: translateY(0.3em);
	}
}

ul li {
	display: inline-block;
	width: 25vw;
	overflow: hidden;
	margin: 0;
	padding: 0;
	white-space: normal;
}

ul li .overlay {
	display: none;
	padding-right: 1em;
	padding-left: 1em;
}

ul li .overlay:before {
	content: "..";
	position: absolute;
	font-family: "Press Start 2P", cursive;
	text-shadow: 0.1em 0.1em black;
	left: 0;
	top: -0.3em;
	letter-spacing: 10.2em;
}

ul li .overlay:after {
	content: "..";
	position: absolute;
	font-family: "Press Start 2P", cursive;
	text-shadow: 0.1em 0.1em black;
	left: 0;
	bottom: 0.1em;
	letter-spacing: 10.2em;
}

ul li.active .overlay {
	position: fixed;
	display: block;
	bottom: 42vh;
	left: calc(50% - 6em);
	min-width: 10em;
	max-width: 10em;
	text-align: center;
	white-space: normal;
	background: #de5918;
	color: #f7d8c7;
	box-shadow: -2px 0 #f7d8c7, 0 -2px #f7d8c7, 0 2px black, 2px 0 black;
	animation: mystery-box 0.5s ease-out 0s 1 normal forwards;
	animation-delay: 0.2s;
	transform-origin: bottom center;
	transform: translateY(4em) scale(0);
}

@keyframes mystery-box {
	0% {
		transform: translateY(3em) scale(0);
	}

	100% {
		transform: translateY(0em) scale(1);
	}
}

ul li.active a {
	border: 2px solid white;
}

ul li a {
	display: block;
	width: 2em;
	height: 2em;
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/1d3110dedd750a9.png)
		no-repeat;
	background-size: 2em;
	cursor: pointer;
	border: 2px solid transparent;
	margin-bottom: 4em;
	&:hover {
		border: 2px solid white;
	}
}

.mario {
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/4717f552c59c347.png)
		no-repeat;
	background-size: 2.5em;
	display: block;
	width: 2.5em;
	height: 2.3em;
	position: fixed;
	bottom: 20vh;
	left: calc(50% - 1.25em);

	&.jump {
		background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/ee2ecc687ac3ded.png)
			no-repeat;
		background-size: 2.5em;
		bottom: calc(20vh + 2em);
	}
}

time {
	display: block;
	font-family: "Press Start 2P", cursive;
	transform-origin: center;
	transform: scaleX(70%);
	margin-top: 1em;
	text-shadow: 0.1em 0.1em black;
}

.bush {
	position: absolute;
	bottom: 0;
	width: 9em;
	height: 2em;
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/baa2bf3f33eab8f.png)
		no-repeat;
	background-size: 9em;
}

.bush1 {
	left: -80vw;
}
.bush2 {
	left: 50%;
}
.bush3 {
	left: 27%;
}
.bush4 {
	right: 70vw;
}
.hill {
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/a3ce658940e9d15.png)
		no-repeat;
	background-size: 8em;
	position: absolute;
	bottom: 0;
	width: 8em;
	height: 3em;
}
.hill1 {
	left: -70vw;
}
.hill2 {
	left: 25%;
}
.hill3 {
	right: 65%;
}
.hill4 {
	right: 65vw;
}
.pipe {
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/ab2b05219d2a12d.png)
		no-repeat;
	background-size: 4em;
	position: absolute;
	bottom: 0;
	width: 10em;
	height: 4em;
}
.pipe1 {
	left: 10vw;
}
.pipe2 {
	left: 45%;
}
.pipe3 {
	right: 35%;
}
.goal {
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/c4104bf2a2cdffc.png)
		no-repeat;
	background-size: 2.5em;
	position: absolute;
	bottom: 0;
	right: 40vw;
	width: 2.5em;
	height: 17.5em;
}
.castle {
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/d73d6701fb6c0c1.png)
		no-repeat;
	background-size: 10em;
	position: absolute;
	bottom: 0;
	right: 0;
	width: 10em;
	height: 9em;
}
.cloud {
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/de22c357bcdfd0e.png)
		no-repeat;
	background-size: 6em;
	position: absolute;
	width: 6em;
	height: 3em;
}
.cloud1 {
	top: -100%;
	left: -10vw;
}
.cloud2 {
	top: -80%;
	left: 35%;
}
.cloud3 {
	top: -90%;
	right: 20%;
}
.cloud-s {
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/53736165bcbfe7e.png)
		no-repeat;
	background-size: 4em;
	position: absolute;
	width: 4em;
	height: 3em;
}
.cloud-s1 {
	top: -50%;
	left: -40vw;
}
.cloud-s2 {
	top: -40%;
	left: 10%;
}
.cloud-s3 {
	top: -55%;
	left: 14%;
}
.cloud-s4 {
	top: -95%;
	left: 40%;
}
.cloud-s5 {
	top: -85%;
	left: 66%;
}
.cloud-s6 {
	top: -55%;
	right: 14%;
}

.coin {
	background: url(https://pixelartmaker-data-78746291193.nyc3.digitaloceanspaces.com/image/ffe952392545e39.png)
		no-repeat;
	background-size: 1.5em;
	position: absolute;
	width: 2.1em;
	height: 2.1em;
	animation: coin 1.5s ease-in-out 0s infinite normal forwards;
	top: -2.5em;
	background-position: center;
}

@keyframes coin {
	0%,
	100% {
		transform: rotateY(0) translateY(-0.3em);
	}

	50% {
		transform: rotateY(90deg) translateY(0.3em);
	}
}
!

JS 

              
                $(document).ready(() => {
	$(window).click(function () {
		$("li").removeClass("active");
	});

	$("li a").on("click", (e) => {
		e.stopPropagation();
		e.target.scrollIntoView({
			behavior: "smooth",
			block: "start",
			inline: "center"
		});
		setTimeout(() => {
			$(".mario").addClass("jump");
		}, 200);
		setTimeout(() => {
			$(".mario").removeClass("jump");
		}, 500);
		$("li").removeClass("active");
		$(e.target.parentElement).addClass("active");

		if (!$(e.target.parentElement).hasClass("visited")) {
			$(e.target.parentElement).addClass("visited");
		}
	});
});
!
999px

Console