style.css

@import url(https://fonts.googleapis.com/css?family=Questrial);
@import url(https://fonts.googleapis.com/css?family=Arvo);

@font-face {
	src: url(https://lea.verou.me/logo.otf);
	font-family: 'LeaVerou';
}

/*
 Shared styles
 */

section h1,
#features li strong,
header h2,
footer p {
	font: 100% Rockwell, Arvo, serif;
}

/*
 Styles
 */

* {
	margin: 0;
	padding: 0;
}

body {
	font: 100%/1.5 Questrial, sans-serif;
	tab-size: 4;
	hyphens: auto;
}

a {
	color: inherit;
}

section h1 {
	font-size: 250%;
}

	section section h1 {
		font-size: 150%;
	}

	section h1 code {
		font-style: normal;
	}

	section h1 > a {
		text-decoration: none;
	}

	section h1 > a:before {
		content: '§';
		position: absolute;
		padding: 0 .2em;
		margin-left: -1em;
		border-radius: .2em;
		color: silver;
		text-shadow: 0 1px white;
	}

	section h1 > a:hover:before {
		color: black;
		background: #f1ad26;
	}

p {
	margin: 1em 0;
}

section h1,
h2 {
	margin: 1em 0 .3em;
}

h2 {
	font-weight: normal;
}

dt {
	margin: 1em 0 0 0;
	font-size: 130%;
}

	dt:after {
		content: ':';
	}

dd {
	margin-left: 2em;
}

strong {
	font-weight: bold;
}

code, pre {
	font-family: Consolas, Monaco, 'Andale Mono', 'Lucida Console', monospace;
	hyphens: none;
}

pre {
	max-height: 30em;
	overflow: auto;
}

pre > code.highlight {
	outline: .4em solid red;
	outline-offset: .4em;
}

header,
body > section {
	display: block;
	max-width: 900px;
	margin: auto;
}

header, footer {
	position: relative;
	padding: 30px -webkit-calc(50% - 450px); /* Workaround for bug */
	padding: 30px calc(50% - 450px);
	color: white;
	text-shadow: 0 -1px 2px black;
	background: url(img/spectrum.png) fixed;
}

header:before,
footer:before {
	content: '';
	position: absolute;
	bottom: 0; left: 0; right: 0;
	height: 20px;
	background-size: 20px 40px;
	background-repeat: repeat-x;
	background-image: linear-gradient(45deg, transparent 34%, white 34%, white 66%, transparent 66%),
	                  linear-gradient(135deg, transparent 34%, white 34%, white 66%, transparent 66%);
}

header {

}

	header .intro,
	html.simple header {
		overflow: hidden;
	}

	header h1 {
		float: left;
		margin-right: 30px;
		color: #7fab14;
		text-align: center;
		font-size: 140%;
		text-transform: uppercase;
		letter-spacing: .25em;
	}

	header h2 {
		margin-top: .5em;
		color: #f1ad26;
	}

		header h1 a {
			text-decoration: none;
		}

		header img {
			display: block;
			width: 150px;
			height: 128px;
			margin-bottom: .3em;
			border: 0;
		}

	header h2 {
		font-size: 300%;
	}

	header .intro p {
		margin: 0;
		font: 150%/1.4 Questrial, sans-serif;
		font-size: 150%;
	}

	#features {
		width: 66em;
		margin-top: 2em;
		font-size: 80%;
	}

		#features li {
			margin: 0 0 2em 0;
			list-style: none;
			display: inline-block;
			width: 27em;
			vertical-align: top;
		}

		#features li:nth-child(odd) {
			margin-right: 5em;
		}

			#features li:before {
				content: '✓';
				float: left;
				margin-left: -.8em;
				color: #7fab14;
				font-size: 400%;
				line-height: 1;
			}

				#features li strong {
					display: block;
					margin-bottom: .1em;
					font-size: 200%;
				}

	header .download-button {
		float: right;
		margin: 0 0 .5em .5em;
	}

	#theme {
		position: relative;
		z-index: 1;
		float: right;
		margin-right: -1em;
		text-align: center;
		text-transform: uppercase;
		letter-spacing: .2em;
	}

		#theme > p {
			position: absolute;
			left: 100%;
			transform: translateX(50%) rotate(90deg) ;
			transform-origin: top left;
			font-size: 130%;
		}

		#theme > label {
			position: relative;
			display: flex;
			justify-content: center;
			align-items: center;
			width: 8.5em;
			height: 8.5em;
			line-height: 1em;
			border-radius: 50%;
			background: hsla(0,0%,100%,.5);
			cursor: pointer;
			font-size: 90%;
			padding: 0;
		}

		#theme > label:before {
			content: '';
			position: absolute;
			top: 0; right: 0; bottom: 0; left: 0;
			z-index: -1;
			border-radius: inherit;
			background: url(img/spectrum.png) fixed;
		}

		#theme > label:nth-of-type(n+2) {
			margin-top: -2.5em;
		}

		#theme > input:not(:checked) + label:hover {
			background: hsla(77, 80%, 60%, .5);
		}

		#theme > input {
			position: absolute;
			clip: rect(0,0,0,0);
		}

		#theme > input:checked + label {
			background: #7fab14;
		}

footer {
	margin-top: 2em;
	background-position: bottom;
	color: white;
	text-shadow: 0 -1px 2px black;
}

	footer:before {
		bottom: auto;
		top: 0;
		background-position: bottom;
	}

	footer p {
		font-size: 150%;
	}

	footer ul {
		column-count: 3;
	}

.download-button {
	display: block;
	padding: .2em .8em .1em;
	border: 1px solid rgba(0,0,0,0.5);
	border-radius: 10px;
	background: #39a1cf;
	box-shadow: 0 2px 10px black,
	   inset 0 1px hsla(0,0%,100%,.3),
	   inset 0 .4em hsla(0,0%,100%,.2),
	   inset 0 10px 20px hsla(0,0%,100%,.25),
	   inset 0 -15px 30px rgba(0,0,0,0.3);
	color: white;
	text-shadow: 0 -1px 2px black;
	text-align: center;
	font-size: 250%;
	line-height: 1.5;
	text-transform: uppercase;
	text-decoration: none;
	hyphens: manual;
}

.download-button:hover {
	background-color: #7fab14;
}

.download-button:active {
	box-shadow: inset 0 2px 8px rgba(0,0,0,.8);
}

#toc {
	position: fixed;
	bottom: 15px;
	max-width: calc(50% - 450px - 40px);
	font-size: 80%;
    z-index: 999;
    background: white;
    color: rgba(0,0,0,.5);
    padding: 0 10px 10px;
	border-radius: 0 3px 3px 0;
	box-sizing: border-box;
}

@media (max-width: 1200px) {
	#toc {
		 display: none;
	}
}

#toc:hover {
    color: rgba(0,0,0,1);
}

	#toc h1 {
		font-size: 180%;
		margin-top: .75rem;
	}

	#toc li {
		list-style: none;
	}

#logo:before {
	content: '☠';
	float: right;
	font: 100px/1.6 LeaVerou;
}

.used-by-logos {
	overflow: hidden;
}
	.used-by-logos > a {
		float: left;
		width: 33.33%;
		height: 100px;
		text-align: center;
		background: #F5F2F0;
		box-sizing: border-box;
		border: 5px solid white;
		position: relative;
	}
		.used-by-logos > a > img {
			max-height: 100%;
			max-width: 100%;
			position: absolute;
			top: 50%;
			left: 50%;
			transform: translate(-50%, -50%);
		}

label a.owner {
	margin: 0 .5em;
}

label a.owner:not(:hover) {
	text-decoration: none;
	color: #aaa;
}

#languages-list ul {
	column-count: 3;
}
	#languages-list li {
		padding: .2em;
	}
	#languages-list li[data-id="javascript"] {
		border-bottom: 1px solid #aaa;
		padding-bottom: 1em;
		margin-bottom: 1em;
		margin-right: 1em;
	}