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CSS

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HTML 

              
                - nav = [
- { name: "masthead"		},
- { name: "tiles"				},
- { name: "text"				},
- { name: "two-columns" },
- { name: "subscribe" },
- ];

- var text = 'Lorem ipsum dolor, sit amet consectetur adipisicing elit. Culpa, tenetur deserunt! Obcaecati eius aut, facere porro amet atque laborum eos, numquam asperiores minus accusantium et tempore repellat voluptatum natus corrupti?';

header
	label.menu(for="burger")
		input#burger(type="checkbox")
		svg.burger(viewBox="0 0 100 100", width="64")
			path.line.top(
				d="m 30,33 h 40 c 13.100415,0 14.380204,31.80258 6.899646,33.421777 -24.612039,5.327373 9.016154,-52.337577 -12.75751,-30.563913 l -28.284272,28.284272"
			)
			path.line.middle(
				d="m 70,50 c 0,0 -32.213436,0 -40,0 -7.786564,0 -6.428571,-4.640244 -6.428571,-8.571429 0,-5.895471 6.073743,-11.783399 12.286435,-5.570707 6.212692,6.212692 28.284272,28.284272 28.284272,28.284272"
			)
			path.line.bottom(
				d="m 69.575405,67.073826 h -40 c -13.100415,0 -14.380204,-31.80258 -6.899646,-33.421777 24.612039,-5.327373 -9.016154,52.337577 12.75751,30.563913 l 28.284272,-28.284272"
			)
	nav
		ul
			each l in nav
				li
					a(
						href='#' + l.name,
						title=l.name,
						style={ '--an': '--' + l.name, '--at': '--' + l.name + '-s' }
					) #{l.name}

main
	section(id=nav[0].name, style={ '--name': '--' + nav[0].name + '-s' })
		.flying-squares
			each square in [1, 2, 3]
				.square
		.masthead
			h1= nav[0].name
			p Press on the heart if you are also a CSS Developer 😃.

	section(id=nav[1].name, style={ '--name': '--' + nav[1].name + '-s' })
		.tile-section
			.tile-container
				- for(x = 1; x <= 20; x++)
					.tile

	section(id=nav[2].name, style={ '--name': '--' + nav[2].name + '-s' })
		.read
			div Reading progress
		.text
			h2 Smooth appearance of text when scrolling
			- for (x = 1; x <= 15; x++)
				p= text

	section(id=nav[3].name, style={ '--name': '--' + nav[3].name + '-s' })
		.two-columns
			h2 Picture arrived on the right
			.content
				.cards
					- for (x = 0; x <= 2; x++)
						.card
							h3.title Card title
							.subtitle Subtitle
							p= text
				.preview
					.img

	section(id=nav[4].name, style={ '--name': '--' + nav[4].name + '-s' })
		.subscribe
			h2 Subscribe now
			p= text
			form(action='' method='POST')
				input(type='email' placeholder='Enter your email')
				button.btn(type='submit')
					span Subscribe
	
	.scroll
		span scroll
		.divider
		span down
footer
	a(
		href="https://twitter.com/intent/follow?screen_name=andrejsharapov",
		target="_blank"
	)
		span X
!

CSS 

              
                :root {
	--text-color: hsl(230 16% 28%);

	/* header */
	--header-bg: hsl(0 0% 100% / 75%);

	/* section */
	--section: hsl(0 0% 93%);
	--section-even: hsl(210deg 15% 92%);

	/* tiles */
	--red: hsl(10 83% 52%);
	--green: hsl(157 91% 43%);
	--blue: hsl(210 100% 45%);
	--purple: hsl(266 100% 67%);
	--yellow: hsl(49 100% 73%);
	--black: hsl(0 0% 0%);

	/*  */
	--cubic: cubic-bezier(0.25, 0.1, 0, 2.05);
}

* {
	box-sizing: border-box;
}

@media (prefers-reduced-motion: no-preference) {
	html {
		scroll-behavior: smooth;
	}
}

body {
	margin: 0;
	display: grid;
	overflow-x: hidden;
	font-family: "Righteous", sans-serif;

	/* scope */
	timeline-scope: --masthead-s, --tiles-s, --text-s, --two-columns-s,
		--subscribe-s;
}

header {
	--show: none;
	--position: relative;
	--b: 0;
	--s: 10%;
	--nav-bg: var(--yellow);

	position: sticky;
	top: 0;
	z-index: 2;
	inline-size: 100%;
	transition: all 200ms linear;

	/* animation */
	animation: height-resize both linear;
	animation-timeline: scroll();
	animation-range: entry 0% exit 20%;

	.menu {
		position: fixed;
		top: 0.25rem;
		left: 0.25rem;
		z-index: 2;
		cursor: pointer;

		& input[type="checkbox"] {
			display: none;
		}

		.burger {
			display: var(--show);
			background-color: var(--header-bg);

			& path {
				fill: none;
				stroke: currentcolor;
				stroke-width: 3;
				transition: stroke-dasharray 400ms, stroke-dashoffset 400ms;

				&.top {
					stroke-dasharray: 40 172;
				}

				&.middle {
					stroke-dasharray: 40 111;
				}

				&.bottom {
					stroke-dasharray: 40 172;
				}
			}
		}

		&:has(input[type="checkbox"]:checked) {
			.burger {
				& path {
					&.top {
						stroke-dashoffset: -132px;
					}

					&.middle {
						stroke-dashoffset: -71px;
					}

					&.bottom {
						stroke-dashoffset: -132px;
					}
				}
			}
		}
	}

	& nav {
		position: var(--position);
		inline-size: inherit;
		display: flex;
		align-items: center;
		justify-content: center;

		/* blur background */
		background-color: var(--header-bg);
		backdrop-filter: blur(6px);

		& ul {
			list-style-type: none;
			display: flex;
			padding: 0;
			grid-column-gap: 3rem;

			& li {
				position: relative;
				padding: 0.5rem 1rem;
				text-transform: uppercase;
				color: var(--text-color);
				transition: transform 0.25s var(--cubic);

				&::after {
					position: absolute;
					content: "";
					left: 0;
					bottom: var(--b);
					z-index: -1;
					inline-size: 100%;
					block-size: var(--s);
					background-color: var(--nav-bg);
					transition: all 0.25s var(--cubic);
				}

				&:has(a:hover) {
					--b: 10%;
					--s: 70%;
				}
			}
		}
	}
}

@media (width <= 48rem) {
	body {
		&:has(input[id="burger"]:checked) {
			scrollbar-gutter: stable;
			overflow-y: hidden;
		}
	}

	header {
		--position: absolute;
		--translateY: -100%;
		--show: block;
		--nav-bg: var(--green);

		& nav {
			top: 0;
			translate: 0 var(--translateY);

			inline-size: 100%;
			block-size: 100dvh;
			padding-inline: 1rem;
			transition: all 200ms ease-in-out;

			& ul {
				block-size: 100%;
				flex-direction: column;
				justify-content: space-evenly;
			}
		}

		& .menu {
			&:has(input[type="checkbox"]:checked) {
				& ~ nav {
					--translateY: 0;
				}
			}
		}
	}
}

@keyframes height-resize {
	to {
		padding-block: 0;
	}
}

:is(h1, h2) {
	margin: 0;
	font-size: calc(2rem + 0.25vw);
}

a {
	text-decoration: none;
	color: currentColor;

	/* animation */
	animation: avtive-link both linear;
	anchor-name: var(--an);
	animation-timeline: var(--at);

	&:not(:hover) {
		opacity: calc(0.5 + var(--active, 0));
	}
}

section {
	min-block-size: 100vh;
	background-color: var(--section);

	/* for animation */
	view-timeline-name: var(--name);

	&:nth-child(even) {
		--section: var(--section-even);
	}
}

.flying-squares {
	position: absolute;
	z-index: 1;

	.square {
		position: inherit;
		width: 15vw;
		height: 15vw;
		rotate: 0.4turn;
		background-color: var(--square-color);
		top: var(--y);
		left: var(--x);
		opacity: 0.3;
		rotate: var(--rx) var(--ry) var(--rz) 0.55turn;
		animation: flying 2s infinite alternate both;

		&:nth-of-type(1) {
			--y: 17vh;
			--x: 8vw;
			--rx: 0.5;
			--ry: 2.1;
			--rz: 1.6;
			--square-color: var(--red);

			animation-delay: 1s;
		}

		&:nth-of-type(2) {
			--y: 8vh;
			--x: 76vw;
			--rx: 1.7;
			--ry: 2.3;
			--rz: 2.1;
			--square-color: var(--purple);
		}

		&:nth-of-type(3) {
			--y: 60vh;
			--x: 40vw;
			--rx: 1.75;
			--ry: 3.5;
			--rz: 2.7;
			--square-color: var(--green);

			animation-delay: 0.5s;
		}
	}
}

@keyframes flying {
	to {
		translate: 0 -5vh;
	}
}

.masthead {
	max-inline-size: 100vw;
	block-size: 100vh;
	overflow: hidden;
	display: grid;
	place-content: center;
	padding-inline: 1rem;

	& h1 {
		position: fixed;
		top: 50%;
		left: 50%;
		translate: -50% -50%;
		text-transform: uppercase;

		/* 	animation	 */
		animation: scale-up both linear, fade-away both linear;
		animation-timeline: var(--name);
		animation-range: entry-crossing 70% exit 90%, exit 10% exit 70%;
	}
}

@keyframes scale-up {
	100% {
		top: 0;
		scale: 5;
	}
}

@keyframes fade-away {
	100% {
		opacity: 0;
	}
}

.tile-section {
	position: sticky;
	top: 0;
	max-inline-size: 100vw;
	block-size: 200vh;
	overflow: hidden;

	& .tile-container {
		position: absolute;
		top: 50%;
		left: 50%;
		translate: -50% -50%;
		scale: 3;
		inline-size: 100%;
		block-size: 100vh;
		display: grid;
		grid-template: repeat(4, 1fr) / repeat(5, 1fr);
		rotate: 0.12turn;

		& .tile {
			inline-size: 100%;
			block-size: 100%;
			background-color: var(--tile);

			/* animation */
			animation: tile both linear;
			/* 			animation-timeline: scroll(root); */
			animation-timeline: var(--name);
			animation-range: entry 100% exit 0%;

			&:nth-of-type(5n + 2),
			&:nth-of-type(5n + 4) {
				--tile: var(--green);
				--vertical: 100%;
				--horizontal: 100%;

				&:nth-of-type(odd) {
					--tile: var(--red);
					--vertical: 100%;
					--horizontal: -100%;
				}
			}

			&:nth-of-type(5n + 1),
			&:nth-of-type(5n + 3),
			&:nth-of-type(5n + 5) {
				--tile: var(--blue);
				--vertical: -100%;
				--horizontal: 100%;

				&:not(:nth-of-type(odd)) {
					--tile: var(--yellow);
					--vertical: -100%;
					--horizontal: -100%;
				}
			}
		}
	}
}

@keyframes tile {
	0% {
		translate: 0 0;
	}

	50% {
		translate: 0 var(--vertical);
	}

	100% {
		translate: var(--horizontal) var(--vertical);
	}
}

.text {
	max-inline-size: 80ch;
	margin-inline: auto;
	padding: 3rem 1rem;
	counter-reset: chapter 0;

	& > *:not(h2) {
		text-wrap: pretty;
		counter-increment: chapter 1;

		/* animation */
		animation: show-text both linear;
		animation-timeline: view(y 80vh auto);

		&::before {
			content: counter(chapter, upper-roman) ". "; /* lower-alpha */
		}
	}
}

/* :has(.text) {
	counter-reset: chapter 0;
	
	& p {
		counter-increment: chapter 1;
	}
	
	.read > * {
		&::after {
			content: ' ' counter(chapter) '%';
		}
	}
} */

@keyframes show-text {
	from {
		opacity: 0;
	}

	to {
		opacity: 1;
	}
}

.read {
	position: fixed;
	top: 68px;
	left: 0;
	z-index: 3;
	inline-size: 0;
	max-inline-size: 100%;
	text-align: right;
	white-space: nowrap;
	padding-block: 0.125rem;
	padding-inline-end: 0.5rem;
	background-image: linear-gradient(
		0.25turn,
		var(--red),
		var(--yellow),
		var(--green),
		var(--blue),
		var(--purple)
	);
	opacity: 0;
	transition: opacity 200ms linear;

	/* animation */
	animation: read-text both linear;
	animation-timeline: var(--name);
	animation-range: entry 100% exit 100%;

	& div {
		filter: invert(100%);
	}
}

@keyframes read-text {
	1% {
		opacity: 1;
	}

	99% {
		inline-size: 100%;
		opacity: 1;
	}

	100% {
		opacity: 0;
	}
}

.two-columns {
	--columns: 1;
	--translateX: 0;

	max-inline-size: 80ch;
	margin-inline: auto;
	block-size: 100%;
	padding: 3rem 1rem;

	.content {
		display: grid;
		grid-template-columns: repeat(var(--columns), 1fr);
		place-content: center;
		gap: 2rem;

		.cards {
			margin-block-start: 2rem;
			display: flex;
			flex-direction: column;
			justify-content: space-between;

			.card {
				box-shadow: inset 0 0 0.125rem var(--text-color);

				/* animation */
				animation: show both linear;
				animation-timeline: var(--name);
				animation-range: entry-crossing var(--range-start);

				&:nth-of-type(1) {
					--range-start: 10%;
				}

				&:nth-of-type(2) {
					--range-start: 40%;
				}

				&:nth-of-type(3) {
					--range-start: 70%;
				}

				&:not(:last-of-type) {
					margin-block-end: 2rem;
				}

				& * {
					margin: 0;
					padding-inline: 1rem;
				}

				.title {
					padding-block-start: 1rem;
				}

				.subtitle {
					padding-block-start: 0.25rem;
					padding-block-end: 1rem;
					opacity: 0.5;
				}

				& p {
					padding-block-end: 1rem;
				}
			}
		}
	}

	.preview {
		position: relative;
		margin-block: 2rem;
		block-size: calc(100% - 1rem);

		.img {
			left: var(--translateX);
			block-size: inherit;
			min-block-size: 24rem;
			object-fit: cover;
			background: var(--red);
		}
	}
}

@media (width >= 48rem) {
	.two-columns {
		--columns: 2;
		--translateX: 150%;

		.preview {
			.img {
				position: absolute;
				top: 0;
				aspect-ratio: 0.5;

				/* animation */
				animation: fade-right both linear;
				animation-timeline: scroll(root);
				animation-range: entry 5% exit 90%;
			}
		}
	}
}

@keyframes fade-right {
	to {
		left: 0;
	}
}

@keyframes show {
	from {
		opacity: 0;
	}

	to {
		opacity: 1;
	}
}

.subscribe {
	max-inline-size: 80ch;
	margin-inline: auto;
	block-size: 100vh;
	padding: 3rem 1rem;
	display: grid;
	place-content: center;
	text-align: center;

	& form {
		position: relative;
		margin-block-start: 2rem;

		/* animation */
		animation: slide-up both linear;
		animation-timeline: var(--name);
		animation-range: entry-crossing 40%;

		& input {
			inline-size: 100%;
			border: 0;
			min-block-size: 3rem;
			margin-block-end: 1rem;
			padding-inline: 0.5rem;
			font-size: calc(1rem + 0.25vw);
			box-shadow: 0 0 0.125rem var(--text-color);

			&:focus {
				outline: thin solid var(--purple);
			}
		}

		& button {
			padding: 0.75rem 1rem;
			text-transform: uppercase;
			cursor: pointer;
			background-color: var(--purple);
			border: 0;

			&:focus {
				outline: thin solid var(--purple);
			}

			& span {
				font-weight: 700;
				filter: invert(100%);
			}
		}
	}
}

@keyframes slide-up {
	from {
		scale: 0;
	}

	to {
		scale: 1;
	}
}

.scroll {
	position: fixed;
	top: 50%;
	left: 0.35rem;
	translate: 0 -50%;
	writing-mode: vertical-lr;
	rotate: 0.5turn;
	display: flex;
	align-items: center;
	gap: 0.5rem;
	opacity: 0.5;

	& .divider {
		inline-size: 2rem;
		block-size: 2px;
		background-color: currentColor;
		opacity: 0.5;
	}

	& span {
		text-transform: lowercase;
		font-weight: bold;
	}
}

@keyframes avtive-link {
	50% {
		--active: 1;
	}
}

footer {
	display: grid;
	place-content: center;
	padding-block: 1rem;

	& a {
		--active: 1;

		padding: 0.5rem 1rem;
		background-color: var(--black);

		& span {
			filter: invert(75%);
		}
	}
}
!

JS
!
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