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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              - var nl = 4;

pre
	span.token--prop --grad-list
	span.token--punct :
	span.token--val: ul
		- for(var i = 0; i < nl; i++) {
			- var j = i%2, k = ~~(i/2);
			li
				span.token--func radial-gradient
				span.token--punc (
				span.token--args
					span.token--arg
						span.token--kwd circle
						span.token--kwd at
						span.token--num #{j*100}
						if j
							span.token--unit %
						| 
						span.token--num #{k*100}
						if k
							span.token--unit %
					span.token--punc ,
					span.token--arg
						span.token--func var
						span.token--punc (
						span.token--prop --stop-list
						span.token--punc )
				span.token--punc )
		- }
section
	h3 mask layers
	.a3d
		while nl--
			.layer
section
	h3 mask applied to a box
	.box
            
          
!
            
              @import 'compass/css3';

$nl: 4;
$p: .5em;
$lh: 1.375;
$t: 12s;

$u: floor(100%/$nl/3);

$theme-dark: #222;
$theme-light: invert($theme-dark);

@mixin mask($m) {
	-webkit-mask: $m;
					mask: $m
}

* {
	margin: 0;
	padding: 0;
	list-style: none;
	color: inherit;
	font: inherit
}

body {
	--f: 1;
	height: 100vh;
	display: flex;
	flex-wrap: wrap;
	font: 1em trebuchet ms, verdana, sans-serif;
}

pre {
	overflow: hidden;
	position: relative;
	padding: $p;
	width: 100%;
	font: 1em/ #{$lh} consolas, monaco, monospace;
	color: $theme-light;
	
	&:before {
		position: absolute;
		z-index: -1;
		top: 0; right: 0; bottom: 0; left: 0;
		background: $theme-dark;
		animation: shift $t infinite;
		content: ''
	}
}

ul {
	display: flex;
	flex-direction: column-reverse;
	animation: shift $t infinite
}

@keyframes shift {	
	0% { transform: translatey(calc(var(--f)*#{-$nl*$lh*1em})) }
	
	@for $i from 0 to $nl {
		#{($i + 1/3)*3*$u}, #{($i + 1)*3*$u} {
			transform: translatey(calc(var(--f)*#{($i + 1 - $nl)*$lh*1em}));
		}
	}
}

li {
	margin-left: 2vw;
	max-width: 31em;
	animation: a $t infinite;
	
	&:nth-child(n + 2):after { content: ',' }
	
	&:nth-child(2n) { --s: 1 }
	
	@for $i from 0 to $nl {
		&:nth-child(#{$i + 1}) {
			animation-name: slide#{$i + 1};
		}
		
		@at-root {
			@keyframes slide#{$i + 1} {
				0%, #{($i + 1/3)*3*$u} {
					transform: translate(calc(var(--s, -1)*100%)) scale(.001)
				}
				#{($i + 2/3)*3*$u}, 100% {
					transform: none
				}
			}
		}
	}
}

section {
	flex: 1;
	overflow: hidden;
	position: relative;
	width: 50%; min-height: calc(100vh - #{5*$lh*1em} - #{2*$p});
	perspective: 21em;
	--f: .5;
	animation: shift $t infinite
}

h3 {
	font: 700 1.75em/ 1.5 kalam, comic sans ms, cursive;
	text-align: center;
}

div {
	position: absolute;
	top: 50%; left: 50%;
	width: 16em; height: 16em;
	max-width: 100%;
	transform: translate(-50%, -50%);
}

.token {
	&--prop { color: #dbbae5 }
	
	&--val {
		white-space: normal
	}
	
	&--func {
		color: #b7e3c0;
		
		&:before { content: ' ' }
	}
	
	&--kwd {
		color: #b8d0dd;
		
		&:after { content: ' ' }
	}
	
	&--num { color: #f8f087 }
	
	&--unit { color: #f39dd4 }
}

.a3d { transform-style: preserve-3d }

.layer {
	background: #000;
	animation: l $t infinite;
	
	&:nth-child(2n) { --s: 1 }
	
	@for $i from 0 to $nl {
		$x: ($i%2)*100%;
		$y: floor($i/2)*100%;
		$m: radial-gradient(circle at $x $y, 
						transparent 19%, #000 0);
		
		&:nth-of-type(#{$i + 1}) {
			-webkit-mask: $m;
							mask: $m;
			animation-name: layer#{$i + 1};
			
			&:after { animation-name: fade#{$i + 1} }
			
			@at-root {
				@keyframes layer#{$i + 1} {
					0%, #{($i + 1/3)*3*$u} {
						transform: 
							translate3d(calc(var(--s, -1)*100% - 50%), -150%, 2em) 
							scale(.001);
					}
					#{($i + 2/3)*3*$u}, 100% {
						transform: translate(-50%, -50%) 
					}
				}
				
				@keyframes fade#{$i + 1} {
					0%, #{($i + 2/3)*3*$u} {
						opacity: .99
					}
					#{($i + 1)*3*$u}, 100% {
						opacity: .001
					}
				}
			}
		}
	}
	
	&:after {
		position: absolute;
		top: 0; right: 0; bottom: 0; left: 0;
		background: #b53;
		animation: f $t infinite;
		content: ''
	}
}

@keyframes mask {
	0%, 100% { @include mask(none) }
	
	@for $i from 0 to $nl {
		$m0: ();
		$m1: ();
		$ac0: 0; $ac1: 1;
		$ar0: 1; $ar1: 1;
		
		@for $j from 0 to $nl {
			$x: ($j%2)*100%;
			$y: floor($j%2)*100%;
			
			@if $i == $j {
				@if $i == 0 { $ac0: 1; $ac1: 0 }
				@else { $ac1: 0; $ar0: 0 }
			}
			@elseif $i < $j { $ar0: 0; $ar1: 0 }
			
			$m0: radial-gradient(circle at $x $y, 
							rgba(#000, $ac0) 19%, 
							rgba(#000, $ar0) 0), $m0;
			$m1: radial-gradient(circle at $x $y, 
							rgba(#000, $ac1) 19%, 
							rgba(#000, $ar1) 0), $m1;
		}
		
		#{($i + 2/3)*3*$u} { @include mask($m0) }
		#{($i + 1)*3*$u} { @include mask($m1) }
	}
}

.box {
	display: flex;
	align-items: center;
	justify-content: center;
	background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/2017/17_05_a_amur_leopard_0.jpg);
	animation: mask $t infinite;
	
	&:after {
		color: #f90;
		font: 700 2em kalam, cursive;
		text-shadow: 2px 2px #000;
		content: 'Amur Leopard'
	}
}

@media (max-aspect-ratio: 4/5) {
	html { overflow-x: hidden; }
	
	body {
		flex-direction: column;
	}
	
	section {
		width: 100%; min-height: calc(50vh - #{2.5*$lh*1em} - #{$p});
	}
}
            
          
!
999px
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