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HTML 

              
                header.header
	.grid-container
		.grid-x.align-middle
			.cell.small-6.medium-1
				.header-logo
					button.header-navOpen
						span
						span
						span
					h4 Reeko
						
			.cell.small-1.medium-9
				nav.header-nav
					button.header-navClose
						span
						span
					a.header-navLink.is-active(href="") Home
					a.header-navLink(href="") About
					a.header-navLink(href="") Services
					a.header-navLink(href="") Contact
			.cell.small-5.medium-2
				.header-cta
					a.header-ctaLink(href="") GitHub
section.hero
	//- .copyright-year
	.hero-title
		h1 Try and Understand
		h2 It really is that bad.
section.slant
	.grid-container
		.grid-x.grid-padding-x
			.cell.medium-4
				.card
					i.fas.fa-glass-cheers
					h3 It won't just go away
					h4 the party's over
					button.card-button Learn More
			.cell.medium-4
				.card
					i.fas.fa-clock
					h3 It's past two o'clock
					h4 so it's about time we stopped
					button.card-button Learn More
			.cell.medium-4
				.card
					i.fas.fa-beer
					h3 'Cause I See
					h4 the keg has been sucked dry
					button.card-button Learn More
section
	.grid-container
		.grid-x
			.cell
				p Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis. Praesent dapibus, neque id cursus faucibus, tortor neque egestas augue, eu vulputate magna eros eu erat. Aliquam erat volutpat. Nam dui mi, tincidunt quis, accumsan porttitor, facilisis luctus, metus.
!

CSS 

              
                // timing
$base-duration: 250ms;

// Colors
$primary: #f46d4c;
$accent: #e4505d;
$white: #fff;
$whitesmoke: whitesmoke;
$text: #555;

// Breakpoints
$sm: 0rem;
$med: 40rem;
$lg: 64rem;
$xlg: 75rem;

// sizes
$max-width: 1200px;
$spacer: 1rem;

// fonts / icons
$awesome: "Font Awesome 5 Free";
$awesomeWeight: 900;
$roboto: 'Roboto', sans-serif;
$robotoSlab: 'Roboto Slab', serif;

*,
*:before,
*:after {
	box-sizing: border-box;
	outline: none;
}

html {
	font-family: $roboto;
	font-size: 16px;
	font-smooth: auto;
	font-weight: 300;
	line-height: 1.5;
	color: #444;
}

body {
	position: relative;
	// display: flex;
	// align-items: center;
	// justify-content: center;
	// width: 100%;
	// height: 100vh;
}

h1, h2, h3, h4, h5 {
	font-family: $robotoSlab;
}

section {
	padding-top: $spacer*3;
}

.header {
	position: fixed;
	width: 100%;
	padding: $spacer 0;
	background: transparent;
	transition: 0.25s;
	z-index: 9999;
	&.sticky {
		background: linear-gradient(
			-45deg, 
			$primary 0, 
			$accent
		);
		box-shadow: 0 0 5px rgba(black,0.2)
	}
	&-logo {
		position: relative;
		display: flex;
		align-items: center;
		justify-content: flex-start;		
		h4 {
			display: inline;
			// align-items: center;
			margin: 0;
			color: $white;
			line-height: 1;
			// &:after {
			// 	position: absolute;
			// 	top: 50%;
			// 	left: 80px;
			// 	content: '';
			// 	width: 0.9375rem;
			// 	height: 0.9375rem;
			// 	background-color: $white;
			// 	border-radius: 50%;
			// 	transform: translateY(-50%);
			// }
		}
	}
	&-nav {
		position: fixed;
		top: 0;
		left: -100%;
		display: flex;
		flex-direction: column;
		justify-content: flex-start;
		width: 90vw;
		height: 100vh;
		padding-top: $spacer*4;
		background-color: rgba($accent,0.95);
		transition: 0.25s;
		z-index:0;
		@media (min-width: $med) {
			width: 40vw;
		}
		&.is-open {
			left: 0%;
			.header-navClose {
				transform: scale(1);
				opacity: 1;
				visibility: visible;
			}
		}
		&Open {
			display: inline-flex;
			flex-direction: column;
			align-items: center;
			justify-content: center;
			width: 0.9375rem;
			height: 0.8125rem;
			margin-top: 0.125rem;
			margin-right: $spacer*0.5;
			border: 0;
			background-color: transparent;
			cursor: pointer;
			span {
				display: block;
				width: 15px;
				height: 2px;
				background-color: $whitesmoke;
				&:first-child {
					transform: translateY(-3px);
				}
				&:last-child {
					transform: translateY(3px);
				}
			}
		}
		&Close {
			position: fixed;
			top: 1.675rem;
			left: $spacer;
			width: 0.9375rem;
			height: 0.8125rem;
			// margin-top: -2px;
			background-color: transparent;
			border: 0;
			transform: scale(0);
			opacity: 0;
			visibility: hidden;
			transition: all 0.25s;
			cursor: pointer;
			@media (min-width: $med) {
				left: $spacer*1.25;
			}
			span {
				position: absolute;
				top: 50%;
				left: 0;
				display: block;
				width: 15px;
				height: 2px;
				background-color: $white;
				&:first-child {
					transform: rotate(45deg);
				}
				&:last-child {
					transform: rotate(-45deg);
				}
			}
		}
		&Link {
			position: relative;
			padding: $spacer;
			// 
			// margin: 0 10px;
			// padding: 10px 0;
			border-bottom: 1px solid rgba($white,0.5);
			color: $white;
			font-size: 0.875rem;
			text-decoration: none;
			&:after {
				position: absolute;
				content: '';
				bottom: 0;
				left: 0;
				width: 0%;
				height: 1px;
				background-color: $white;
				transition: 0.25s linear;
			}
			&.is-active {
				font-weight: bold;
			}
			&.is-active,
			&:hover {
				&:after {
					width: 100%;
				}
			}
		}
	}
	&-cta {
		display: flex;
		justify-content: flex-end;
		&Link {
			padding: 5px 20px;
			border: 1px solid $white;
			border-radius: 3px;
			color: $white;
			font-size: 0.875rem;
			text-decoration: none;
		}
	}
}

.hero {
	position: relative;
	display: flex;
	align-items: center;
	justify-content: center;
	height: 45vh;
	background: linear-gradient(
		180deg, 
		$primary 0, 
		$accent
	);
	&-title {
		margin-top: 5rem;
		text-align: center;
		h1, h2 {
			margin: 0;
			color: $white;
		}
		h2 {
			font-weight: 300;
		}
	}
	
}
.slant {
	position: relative;
	display: block;
	padding-bottom: 30px;
	background-color: $white;
	@media (min-width: 768px) {
		padding-top: 0 !important;
		&:before {
			content: "";
			display: block;
			height: 200px;
			margin-bottom: 50px;
			background: linear-gradient(
				to right bottom,
				$accent 49.9%,
				transparent 50.1%
			);
		}
	}
}
.card {
	position: relative;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: space-between;
	margin-bottom: $spacer*2;
	padding: $spacer*2;
	background-color: $whitesmoke;
	//border: 1px solid $primary;
	border-radius: $spacer*0.5;
	// box-shadow: 0 0 5px rgba(black,0.2);
	text-align: center;
	@media (min-width: $med) {
		height: 100%;
	}
	h3 {
		margin-bottom: 0;
	}
	h4 {
		margin-top: 0;
		margin-bottom: $spacer*1.75;
		font-weight: 300;
	}
	i {
		color: $primary;
		font-size: 3.5rem;
	}
	&-button {
		position: relative;
		display: inline-block;
		width: auto;
		padding: $spacer*0.75 $spacer*2;
		background-color: $primary;
		border: 0;
		border-radius: $spacer*0.25;
		color: $white;
		font-family: $roboto;
		font-size: 0.75rem;
		text-transform: uppercase;
	}
}















// grid shtuff
.grid-container {
	max-width: $max-width;
	margin: 0 auto;
	padding: 0 $spacer;
	@media (min-width: $med) {
		padding: 0 $spacer*1.25;
	}
	&.full {
		width: 100%;
		padding: 0 !important;
	}
	.grid-x {
		position: relative;
		display: flex;
		flex-wrap: wrap;
		width: 100%;
		@media (min-width: $sm) {
			
		}
		@media (min-width: $med) {
			flex-direction: row;
			//flex-wrap: wrap;
		}
		&.align-left {
			justify-content: flex-start;
		}
		&.align-right {
			justify-content: flex-end;
		}
		&.align-justify {
			justify-content: space-between;
		}
		&.align-top {
			align-items: flex-start;
		}
		&.align-bottom {
			align-items: flex-end;
		}
		&.align-middle {
			align-items: center;
		}
		&.align-center {
			align-items: center;
			justify-content: center;
		}
		&.align-stretch {
			align-items: stretch;
		}
		&.grid-margin-x {
			.cell {
				margin-left: 10px;
				margin-right: 10px;
			}
		}
		&.grid-padding-x {
			.cell {
				padding-left: 10px;
				padding-right: 10px;
			}
		}
		&.grid-margin-y {
			.cell {
				margin-top: 10px;
				margin-bottom: 10px;
			}
		}
		&.grid-padding-y {
			.cell {
				padding-top: 10px;
				padding-bottom: 10px;
			}
		}
	}
}
.cell {
	display: block;
	width: 100%;
	&.auto {
		flex: 0 0 auto;
		width: auto;
	}
	&.grow {
		flex: 1 0 auto;
		width: auto;
	}
	&.shrink {
		flex: 0 1 auto;
		width: auto;
	}
	&.small-1 { 
		@media (min-width: $sm) {
			width: 8.3333%; 
		}
	}
	&.small-2 { 
		@media (min-width: $sm) {
			width: 16.6666%; 
		}
	}
	&.small-3 { 
		@media (min-width: $sm) {
			width: 25%; 
		}
	}
	&.small-4 { 
		@media (min-width: $sm) {
			width: 33.3333%;
		}
	}
	&.small-5 { 
		@media (min-width: $sm) {
			width: 41.6666%; 
		}
	}
	&.small-6 { 
		@media (min-width: $sm) {
			width: 50%; 
		}
	}
	&.small-7 { 
		@media (min-width: $sm) {
			width: 58.3333%; 
		}
	}
	&.small-8 { 
		@media (min-width: $sm) {
			width: 66.6666%; 
		}
	}
	&.small-9 { 
		@media (min-width: $sm) {
			width: 75%; 
		}
	}
	&.small-10 { 
		@media (min-width: $sm) {
			width: 83.3333%; 
		}
	}
	&.small-11 { 
		@media (min-width: $sm) {
			width: 91.666612%; 
		}
	}
	&.medium-1 { 
		@media (min-width: $med) {
			width: 8.3333%; 
		}
	}
	&.medium-2 { 
		@media (min-width: $med) {
			width: 16.6666%;
		}
	}
	&.medium-3 { 
		@media (min-width: $med) {
			width: 25%; 
		}
	}
	&.medium-4 { 
		@media (min-width: $med) {
			width: 33.3333%; 
		}
	}
	&.medium-5 { 
		@media (min-width: $med) { 
			width: 41.6666%; 
		}
	}
	&.medium-6 { 
		@media (min-width: $med) {
			width: 50%; 
		}
	}
	&.medium-7 { 
		@media (min-width: $med) {
			width: 58.3333%; 
		}
	}
	&.medium-8 { 
		@media (min-width: $med) {
			width: 66.6666%; 
		}
	}
	&.medium-9 { 
		@media (min-width: $med) {
			width: 75%; 
		}
	}
	&.medium-10 { 
		@media (min-width: $med) {
			width: 83.3333%; 
		}
	}
	&.medium-11 { 
		@media (min-width: $med) {
			width: 91.666612%; 
		}
	}
	&.large-1 { 
		@media (min-width: $lg) {
			width: 8.3333%; 
		}
	}
	&.large-2 { 
		@media (min-width: $lg) {
			width: 16.6666%; 
		}
	}
	&.large-3 { 
		@media (min-width: $lg) {
			width: 25%; 
		}
	}
	&.large-4 { 
		@media (min-width: $lg) {
			width: 33.3333%; 
		}
	}
	&.large-5 { 
		@media (min-width: $lg) {
			width: 41.6666%; 
		}
	}
	&.large-6 { 
		@media (min-width: $lg) {
			width: 50%; 
		}
	}
	&.large-7 { 
		@media (min-width: $lg) {
			width: 58.3333%; 
		}
	}
	&.large-8 { 
		@media (min-width: $lg) {
			width: 66.6666%; 
		}
	}
	&.large-9 { 
		@media (min-width: $lg) {
			width: 75%; 
		}
	}
	&.large-10 { 
		@media (min-width: $lg) {
			width: 83.3333%; 
		}
	}
	&.large-11 { 
		@media (min-width: $lg) {
			width: 91.666612%; 
		}
	}

	&.align-self-right {
		display: flex;
		justify-content: flex-end;
	}
    &.align-self-left {
		display: flex;
		justify-content: flex-start;
	}
}
!

JS 

              
                // $(".copyright-year").length >= 1 && $(".copyright-year").html("").append((new Date).getFullYear());

const openButton = document.querySelector('.header-navOpen');
const closeButton = document.querySelector('.header-navClose');
const navigation = document.querySelector('.header-nav');

openButton.addEventListener('click', () => {
	navigation.classList.add('is-open');
});

closeButton.addEventListener('click', () => {
	navigation.classList.remove('is-open');
});

const header = document.querySelector('.header');
const sticky = navigation.offsetTop;

window.addEventListener('scroll', () => {
	if(window.scrollY > sticky) {
		header.classList.add('sticky');
	} else {
		header.classList.remove('sticky');
	}
});
!
999px

Console