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HTML 

              
                <header>
	<div class="nav">
		<div class="title">
			Navigation
		</div>
		<div class="toggle">
			<div class="bar"></div>
		</div>
		
		<nav class="">
			<div class="showcase">
				<div class="showcase-container">
					<ul class="showcase-menu">
						<li>Hi!</li>
						<li>Hover over the list items or click them!</li>
						<li><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/124740/ice-final-white.svg" alt=""></li>
						<li class="overlay" style="background-image:url(https://images.unsplash.com/photo-1537949721120-e8f21f6698e6?ixlib=rb-0.3.5&s=96527c5eff0b3bd24946f77f4dc5a789&auto=format&fit=crop&w=634&q=80);">
							Lorem ipsum
						</li>
						<li style="background-image:url(https://d2kbkpwf98wmwo.cloudfront.net/images/menu/motion.png);"></li>
						<li>ABC</li>
						<li style="background-image:url(https://images.unsplash.com/photo-1537914675540-ec9f82fbd752?ixlib=rb-0.3.5&s=7d427165e9b4e7aa8d80b19c9d0b3128&auto=format&fit=crop&w=1316&q=80);"></li>
						<li style="background-image:url(https://d2kbkpwf98wmwo.cloudfront.net/images/menu/color.png);"></li>
					</ul>
				</div>
			</div>
			
			<div class="menu">
				<ul class="main-menu">
					<li class="active"><a href="#!">Introduction</a></li>
					<li><a href="#!">The System</a></li>
					<li><a href="#!">Logo</a></li>
					<li><a href="#!">Composition</a></li>
					<li><a href="#!">Motion</a></li>
					<li><a href="#!">Typography</a></li>
					<li><a href="#!">Photography</a></li>
					<li><a href="#!">Color</a></li>
				</ul>
			</div>
		</nav>
		
	</div>
</header>

<div class="content">
	<p>
		Navigation like on the <a href="https://www.uber.design/case-studies/rebrand-2018" target="_blank">Uber Rebrand Site</a>
	</p>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Noto+Sans:400,700');

$main: #EF3340;

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	font-family: 'Noto Sans', sans-serif;
}

*::selection {
	background: rgba(0,0,0,.2);
	color: #fff;
}

html, body {
	width: 100%;
	height: 100%;
}

body {
	overflow: hidden;
	display: flex;
	transition: padding .5s cubic-bezier(.25,.46,.45,.94);
}

a {
	text-decoration: none;
	color: $main;
}

header {
	z-index: 5;
	opacity: 0;
	transition: opacity .5s cubic-bezier(.25,.46,.45,.94);
	
	.nav {
		position: fixed;
		left: 0;
		top: 0;
		width: 100%;
		height: 80px;
		
		.title {
			line-height: 80px;
			padding: 0 120px;
			font-size: 24px;
			color: #fff;
			font-weight: 900;
		}
		
		.toggle {
			position: absolute;
			margin: auto;
			width: 46px;
			height: 46px;
			right: 120px;
			top: 0;
			bottom: 0;
			display: flex;
			justify-content: center;
			align-items: center;
			z-index: 10;
			cursor: pointer;
			
			.bar {
				position: relative;
				width: 40px;
				height: 2px;
				background: #fff;
				
				&:before, &:after {
					content: '';
					position: absolute;
					width: 100%;
					height: 100%;
					background: inherit;
					left: 0;
					transform-origin: center center;
					transition: transform .25s ease, top .25s ease, bottom .25s ease;
				}
				
				&:before {
					top: -10px;
				}
				
				&:after {
					bottom: -10px;
				}
			}
			
			&.clicked {
				.bar {
					background: transparent;
					
					&:before, &:after {
						background: #000;
					}
					
					&:before {
						transform: rotate(45deg);
						top: 0;
					}
					&:after {
						transform: rotate(-45deg);
						bottom: 0;
					}
				}
			}
		}
		
		nav {
			position: fixed;
			left: 0;
			top: 0;
			width: 100vw;
			height: 100vh;
			display: flex;
			flex-direction: row;
			opacity: 0;
			z-index: 5;
			transition: opacity .5s ease;
			
			.showcase {
				background: #000;
				flex: 1;
				color: #fff;
				display: flex;
				justify-content: center;
				align-items: center;
				
				.showcase-container {
					width: 50%;
					position: relative;
					overflow: hidden;
					
					&:before {
						content: '';
						display: block;
						padding-top: 100%;
					}
				}
				
				.showcase-menu {
					position: absolute;
					left: 0;
					top: 0;
					width: 100%;
					height: 100%;
					overflow-y: visible;
					list-style-type: none;
					transition: top .25s ease;
					
					
					li {
						width: 100%;
						height: 100%;
						display: flex;
						justify-content: center;
						align-items: center;
						font-size: 40px;
						text-transform: uppercase;
						text-align: center;
						overflow: hidden;
						background-position: center center;
						background-repeat: no-repeat;
						background-size: cover;
						position: relative;
						z-index: 1;
						
						&.overlay {
							&:before {
								content: '';
								position: absolute;
								left: 0;
								top: 0;
								right: 0;
								bottom: 0;
								background: rgba(0,0,0,.6);
								z-index: -1;
							}
						}
					}
				}
			}
			
			.menu {
				background: #fff;
				flex: 1;
				
				ul {
					width: 100%;
					padding: 80px 48px 24px 48px;
					list-style-type: none;
					max-height: 100%;
					overflow-y: auto;
					
					&::-webkit-scrollbar {
						width: 6px;
						height: 10px;

						&-button {
							width: 0px;
							height: 0px;
						}

						&-thumb {
							background: rgba(0,0,0,.4);
							border: 0px none #ffffff;
							border-radius: 3px;

							&:hover {
								background: #000;
							}

							&:active {
								background: #000;
							}
						}

						&-track {
							background: rgba(0,0,0,.1);
							border: 0px none #ffffff;
							border-radius: 0;

							&:hover {
								background: rgba(0,0,0,.1);
							}

							&:active {
								background: rgba(0,0,0,.1);
							}
						}

						&-corner {
							background: transparent;
						}
					}
					
					li {
						display: flex;
						flex-direction: row;
						align-items: center;
						
						.number {
							display: inline-block;
							padding: 0 0 0 80px;
							overflow: hidden;
							
							span {
								display: block;
								font-size: 48px;
								font-weight: 400;
								transition: transform .25s ease;
								transform: translateY(100%);
							}
						}
						
						a {
							display: inline-block;
							font-size: 48px;
							color: #000;
							line-height: 1;
							padding: 24px 0 24px 80px;
							transition: transform .25s ease;
						}
						
						&:hover {
							a {
								transform: translateX(20px);
							}
						}
						
						&.hover {
							.number {
								span {
									transform: translateY(0);
								}
							}
						}
					}
				}
			}
			
			&.hidden {
				display: none;
			}
			
			&.open {
				opacity: 1;
				
				.showcase {
					animation: slideInLeft .5s cubic-bezier(.3, 0, .3, 1) forwards;
				}
				
				.menu {
					animation: slideInRight .5s cubic-bezier(.3, 0, .3, 1) forwards;
				}
			}
		}
	}
}


@keyframes slideInRight {
	from {
		transform: translateX(100%);
	}
	to {
		transform: translateX(0);
	}
}

@keyframes slideInLeft {
	from {
		transform: translateX(-100%);
	}
	to {
		transform: translateX(0);
	}
}

.content {
	position: relative;
	flex: 1;
	padding: 80px 40px 40px;
	background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/124740/2018-09-28%2009_21_48-https___d2kbkpwf98wmwo.cloudfront.net_videos_hero-lg.mp4.png);
	background-repeat: no-repeat;
	background-position: center center;
	background-size: cover;
	
	p {
		color: #fff;
		opacity: 0;
		transition: opacity .5s cubic-bezier(.25,.46,.45,.94);
		
		a {
			color: #fff;
			box-shadow: 0 1px 0 0 $main;
		}
	}
}
!

JS 

              
                $(document).ready(function() {
	navNumbers();
	backToDefault();
	
	// show hovered li stuff
	$('.main-menu').on('mouseover', 'li', function() {
		showTarget($(this));
	});

	// show default .active li stuff
	$('.main-menu').on('mouseleave', backToDefault);
	
	// change active list item
	$('.main-menu').on('click', 'li', function() {
		changeActive($(this));
	});
	
	// toggle menu
	$('.toggle').on('click', toggleMenu);
	
	// for showcase only
	var tl = new TimelineMax(),
			body = $('body'),
			header = $('header'),
			content = $('.content p'),
			toggle = $('.toggle'),
			nav = $('nav');
	
	tl.to(body, 1, {
		padding: '0 80px 80px',
		delay: .5
	});
	
	tl.to(header, .25, {
		opacity: 1,
		delay: .5
	});
	
	tl.to(content, .25, {
		opacity: 1
	}, '-=.25');
	
	tl.call(function() {
		toggleMenu();
	}, null, null, 3);
	
	tl.call(function() {
		toggleMenu();
	}, null, null, 4.5);

});

// toggle menu
function toggleMenu() {
	var toggle = $('.toggle');
	var nav = $('nav');
	
	if(toggle.hasClass('clicked')) {
		toggle.removeClass('clicked');
		nav.removeClass('open');
		console.log('remove open');
		setTimeout(function() {
			console.log('add hidden');
			nav.addClass('hidden');
		}, 500);
	} else {
		nav.removeClass('hidden');
		toggle.addClass('clicked');
		nav.addClass('open');
	}
}

// give the list items numbers
function navNumbers() {
	var sum = $('.main-menu li').length;
	var i = 0;
	var x = 0;

	$('.showcase-menu li').each(function() {
		$(this).attr('data-target', x);
		x++;
	});
	
	$('.main-menu li').each(function() {
		var number = ('0' + i).slice(-2);
		var numberElement = '<div class="number"><span>'+number+'</span></div>';
		$(this).prepend(numberElement);
		$(this).attr('data-target', i);
		i++;
	});
}


// show the hovered list item stuff
function showTarget(e) {
	$('.main-menu li').removeClass('hover');
	
	var target = $(e).attr('data-target');
	var showcaseHeight = $('.showcase-menu').outerHeight();
	
	showcaseHeight = (showcaseHeight * target) * -1;
	
	$('.showcase-menu').css({
		top: showcaseHeight
	});
	
	$(e).addClass('hover');
}

// show the list item stuff of .active
function backToDefault() {
	$('.main-menu li').removeClass('hover');
	
	var activeItem = $('.main-menu li.active');
	var target = activeItem.attr('data-target');
	var showcaseHeight = $('.showcase-menu').outerHeight();
	
	showcaseHeight = (showcaseHeight * target) * -1;
	
	$('.showcase-menu').css({
		top: showcaseHeight
	});
	
	activeItem.addClass('hover');
}


// change active list item
function changeActive(e) {
	$('.main-menu li').removeClass('active');
	$(e).addClass('active');
}
!
999px

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