index.css

/*
* Prefixed by https://autoprefixer.github.io
* PostCSS: v7.0.29,
* Autoprefixer: v9.7.6
* Browsers: last 4 version
*/

/* default stuff */
:root {
	--white: #fff;
	--light: #ddd;
	--dark: #4f4f4f;
}

* {
	-webkit-box-sizing: border-box;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
	font-weight: normal;

	user-select: none;
}

html, body, :root {
	font-family: 'Main', Roboto, sans-serif;
	color: black;
	max-width: 1280px;
	margin: 0 auto;
	background: var(--white);
}

html {
	scroll-behavior: smooth;
}

body {
	min-height: 100vh;
}

h2 {
	font-size: 1.5rem;
}

h3 {
	font-size: 1.25rem;
}

p {
	font-size: 1rem;
	line-height: 125%;
}

ul, ol {
	list-style-type: none;
}

a {
	text-decoration: none;
	color: inherit;
}

a:active {
	background-color: rgba(0, 0, 0, 0.05);
}

hr {
	border: 0;
	height: 1px;
	background: var(--light);
	margin-top: 0.5rem;
	margin-bottom: 0.5rem;
}

/* colorful bottom line */

li::after {
	margin-top: -3px;
	display: block;
	content: '';
	height: 3px;
	width: 100%;
	opacity: 0;
	-webkit-transition: opacity 0.2s ease;
	-o-transition: opacity 0.2s ease;
	transition: opacity 0.2s ease;
}

li:hover::after {
	opacity: 1;
}

/* navigation */

nav {
	width: 100%;
}

nav #MenuTrigger {
	display: none;
}

nav #MenuTriggerLabel {
	display: none;
}

nav ul {
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	-webkit-box-orient: horizontal;
	-webkit-box-direction: normal;
	-ms-flex-direction: row;
	flex-direction: row;
	-webkit-box-pack: start;
	-ms-flex-pack: start;
	justify-content: flex-start;
	-webkit-box-align: center;
	-ms-flex-align: center;
	align-items: center;
	-ms-flex-wrap: wrap;
	flex-wrap: wrap;
}

nav ul li {
	width: auto;
	height: auto;
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	-webkit-box-orient: vertical;
	-webkit-box-direction: normal;
	-ms-flex-direction: column;
	flex-direction: column;
	-webkit-box-pack: center;
	-ms-flex-pack: center;
	justify-content: center;
	-webkit-box-align: center;
	-ms-flex-align: center;
	align-items: center;
}

nav ul li a {
	cursor: pointer;
	padding: 0.5rem 2rem;
	font-size: 1rem;
}

/* sections */

section header {
	width: 100%;
	max-width: 30rem;
	padding: 1rem 0 1rem 3rem;
	border-bottom: solid 4px var(--dark);
}

section ul {
	padding: 1rem 2rem;
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
	grid-auto-rows: 9rem;
	grid-gap: 1rem;
}

section ul li {
	border: solid 1px var(--light);
}

section ul li a {
	width: 100%;
	height: 100%;
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	-webkit-box-orient: horizontal;
	-webkit-box-direction: normal;
	-ms-flex-direction: row;
	flex-direction: row;
	-webkit-box-pack: justify;
	-ms-flex-pack: justify;
	justify-content: space-between;
	-webkit-box-align: center;
	-ms-flex-align: center;
	align-items: center;
}

section ul li a aside {
	margin-left: 1rem;
	-webkit-box-flex: 0;
	-ms-flex: 0 0 auto;
	flex: 0 0 auto;
}

section ul li a aside svg,
section ul li a aside img {
	width: 4rem;
	height: 4rem;

	-webkit-user-drag: none;
}

section ul li a main {
	width: 100%;
	height: 100%;
	margin: 0 1rem;
	display: flex;
	flex-direction: column;
	justify-content: center;
}

section ul li a main > * {
	width: 100%;
}

section ul li a main p {
	display: -webkit-box;
	overflow: hidden;
	-webkit-line-clamp: 3;
	-webkit-box-orient: vertical;
	text-overflow: ellipsis;
	word-break: break-word;
}

/* footer */

footer {
	width: 100%;
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	-webkit-box-orient: horizontal;
	-webkit-box-direction: normal;
	-ms-flex-direction: row;
	flex-direction: row;
	-webkit-box-pack: justify;
	-ms-flex-pack: justify;
	justify-content: space-between;
	-webkit-box-align: start;
	-ms-flex-align: start;
	align-items: flex-start;
	padding: 1rem 3rem;
}

/* custom classes */

.error {
	padding: 1rem;
}

.error div {
	color: darkred;
	background-color: white;
	border: 1px solid darkred;
	padding: 1rem;
	font-size: 1rem;
}

.error div hr {
	background: darkred;
}

/* svg */

text {
	font: bold 12rem sans-serif;
	fill: white;
}

/* media queries */

@media (max-width: 600px) {
	nav {
		position: fixed;
		top: 0;
		left: 0;
		right: 0;
		height: 3rem;

		display: flex;
		align-items: center;

		background: white;
		box-shadow: 0 2px 2px 0 #dddddd;
	}

	nav #MenuTrigger:checked ~ ul::before {
		content: '';
		position: fixed;
		top: 3rem;
		left: 260px;
		right: 0;
		bottom: 0;
		pointer-events: all;

		background-color: black;
		opacity: 0.5;
	}

	nav #MenuTriggerLabel {
		display: block;
		font-size: 1.2rem;
		padding-left: 2rem;
	}

	nav #MenuTriggerLabel::before {
		content: '☰ ';
		display: inline-block;
		width: 1.2rem;
		height: 1.2rem;
	}

	nav #MenuTrigger:checked + #MenuTriggerLabel::before {
		content: ' 🗙 ';
	}

	nav > ul {
		background: white;

		display: block;
		position: fixed;
		top: 3rem;
		bottom: 0;
		left: -260px;
		width: 260px;

		overflow-y: auto;
	}

	nav > ul > li {
		align-items: flex-start;
	}

	nav ul li > a {
		display: block;
		width: 100%;
	}

	nav #MenuTrigger:checked ~ ul {
		left: 0;
	}

	section:first-of-type {
		margin-top: 3rem
	}

	section header {
		max-width: unset;
		padding-left: 2rem;
	}

	section ul {
		padding: 1rem;
		grid-template-columns: 1fr;
	}

	li::after {
		-webkit-transition: none;
		-o-transition: none;
		transition: none;
	}

	section ul li a {
		width: 100%;
	}

	footer {
		padding: 1rem 2rem;
	}

	.error:first-of-type {
		margin-top: 0;
	}
}

@media (max-width: 319px) {
	section ul li a aside {
		margin: 0;
	}

	section ul li a aside svg,
	section ul li a aside img {
		display: none;
	}
}

/* print */
@media only print {
	nav { display: none; }

	section header {
		padding-left: 1rem;
		break-after: avoid;
		break-before: page;
	}

	section ul {
		display: block;
		padding: 1rem;
	}

	section ul li {
		border: none;
		page-break-inside: avoid;
		margin-top: 1rem;
	}

	section ul li a {
		display: block;
	}

	section ul li a aside,
	section ul li a main {
		margin-left: 0;
	}

	section ul a hr {
		display: none;
	}

	section ul a::after {
		content: "(Link: " attr(href) ")";
		display: block;
	}

	footer {
		page-break-before: avoid;
		margin-top: 1rem;
	}
}