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Adding Classes

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CSS

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HTML 

              
                mixin box(name)
	.box(class=name)
		.lt
		.rt
		.tp
		.bt
		.ft
		.bk

.scene
	.particle(style="--dur: 20s")
		+box('particle-1')
	.particle(style="--dur: 25s")
		+box('particle-2')
	.particle(style="--dur: 30s")
		+box('particle-3')
	.tardigrade
		.head
			+box('head-large')
			+box('head-small')
			.mouth-group
				+box('mouth')
				+box('mouth')
				+box('mouth')
				+box('mouth')
				+box('mouth')
				+box('mouth')
		.body-segment.ft
			.body-ani.reverse
				+box('chunk')
				+box('chunk-small')
				.left-leg
					.leg-ani.forward
						+box('leg')
						.toes
							+box('toe')
							+box('toe')
							+box('toe')
							+box('toe')
				.right-leg
					.leg-ani.reverse
						+box('leg')
						.toes
							+box('toe')
							+box('toe')
							+box('toe')
							+box('toe')
		.body-segment.ft_mid
			.body-ani.forwards
				+box('chunk')
				+box('chunk-small')
				.left-leg
					.leg-ani.reverse
						+box('leg')
						.toes
							+box('toe')
							+box('toe')
							+box('toe')
							+box('toe')
				.right-leg
					.leg-ani.forward
						+box('leg')
						.toes
							+box('toe')
							+box('toe')
							+box('toe')
							+box('toe')
		.body-segment.bk_mid
			.body-ani.reverse
				+box('chunk')
				+box('chunk-small')
				.left-leg
					.leg-ani.forward
						+box('leg')
						.toes
							+box('toe')
							+box('toe')
							+box('toe')
							+box('toe')
				.right-leg
					.leg-ani.reverse
						+box('leg')
						.toes
							+box('toe')
							+box('toe')
							+box('toe')
							+box('toe')
		.body-segment.bk
			.body-ani.forwards
				+box('chunk')
				.left-leg
					.leg-ani.reverse
						+box('leg')
						.toes
							+box('toe')
							+box('toe')
							+box('toe')
							+box('toe')
				.right-leg
					.leg-ani.forward
						+box('leg')
						.toes
							+box('toe')
							+box('toe')
							+box('toe')
							+box('toe')
!

CSS 

              
                // Cube
// Sizing: --w: width, --h: height, --d: depth
// Position: --x: x-axis translation, --y: y-axis translation, --z: z-axis translation
// Rotation: --rx: rotateX, --ry: rotateY, --rz: rotateZ
.box {
	--d2: calc(var(--d) / 2);
	position: absolute;
	width: var(--w);
	height: var(--h);
	transform: translate3d(var(--x), var(--y), var(--z)) rotatex(var(--rx))
		rotatey(var(--ry)) rotatez(var(--rz));
	div {
		position: absolute;
		// outline: 1px solid rgba(black, 1);
	}
	.lt {
		width: var(--d);
		height: var(--h);
		left: 0;
		transform: rotateY(-90deg) translatez(var(--d2));
	}
	.rt {
		width: var(--d);
		height: var(--h);
		right: 0;
		transform: rotateY(90deg) translatez(var(--d2));
	}
	.tp {
		width: var(--w);
		height: var(--d);
		top: 0;
		transform: rotateX(90deg) translateZ(var(--d2));
	}
	.bt {
		width: var(--w);
		height: var(--d);
		bottom: 0;
		transform: rotateX(-90deg) translateZ(var(--d2));
	}
	.ft {
		width: var(--w);
		height: var(--h);
		transform: translateZ(var(--d2));
	}
	.bk {
		width: var(--w);
		height: var(--h);
		transform: rotateY(180deg) translateZ(var(--d2));
	}
}

@mixin color($col) {
	// color the cubes from one hex
	.ft {background: scale-color($col, $lightness: 10%)}
	.tp {background: scale-color($col, $lightness: 34%)}
	.lt {background: scale-color($col, $lightness: -12%)}
	.bk {background: scale-color($col, $lightness: -32%)}
	.rt {background: scale-color($col, $lightness: 17%)}
	.bt {background: scale-color($col, $lightness: -26%)}
}

@mixin vars($w: 0, $h: 0, $d: 0, $x: 0, $y: 0, $z: 0, $rx: 0, $ry: 0, $rz: 0) {
	--w: calc(#{$w} * 1vmin); // width
	--h: calc(#{$h} * 1vmin); // height
	--d: calc(#{$d} * 1vmin); // depth
	--x: calc(#{$x} * 1vmin); // translate-x
	--y: calc(#{$y} * 1vmin); // translate-y
	--z: calc(#{$z} * 1vmin); // translate-z
	--rx: calc(#{$rx} * 1deg); // rotate-x
	--ry: calc(#{$ry} * 1deg); // rotate-y
	--rz: calc(#{$rz} * 1deg); // rotate-z
}

// Setting up the scene
:root {
	--scene-width: 60vmin;
	--scene-height: 20vmin;
	--scene-depth: 60vmin;
	--scene-scale: 1.3;
}

body {
	display: grid;
	place-items: center;
	min-height: 100vh;
	overflow: hidden;
	perspective: 700px;
	background: 
		radial-gradient(white 0%, black 100%),
		radial-gradient(#2CD8D5 0%, #C5C1FF 48%, #FFBAC3 100%);
	background-blend-mode: soft-light;
}

.scene {
	--rx: -20deg;
	--ry: -20deg;
	position: relative;
	transform-style: preserve-3d;
	width: var(--scene-width);
	height: var(--scene-height);
	cursor: grab;
	transform: rotateX(var(--rx)) rotateY(var(--ry))
		scale3d(var(--scene-scale), var(--scene-scale), var(--scene-scale));
	* {
		box-sizing: border-box;
		transform-style: preserve-3d;
	}
	&:active {
		cursor: grabbing;
	}
}

// Tardigrade
.tardigrade {
	transform: translate3d(25vmin, 0vmin, 12vmin);
	@include color(#9b3b6c);
	.head {
		width: 9vmin;
		.head-large {
			@include vars(9, 9, 8, 0, 0, 0);
		}
		.head-small {
			@include vars(5, 5, 2, 2, 2, 5);
			@include color(lighten(#9b3b6c, 2%));
		}
		.mouth-group {
			transform: translate3d(3.75vmin, 3.75vmin, 6.5vmin);
			.mouth {
				@include vars(1.5, 0.5, 1.25, 0, 0, 0);
				&:nth-child(1) {
					--y: -0.5vmin;
				}
				&:nth-child(2) {
					--x: 1vmin;
					--rz: 60deg;
				}
				&:nth-child(3) {
					--x: 1vmin;
					--y: 1vmin;
					--rz: 120deg;
				}
				&:nth-child(4) {
					--y: 1.6vmin;
				}
				&:nth-child(5) {
					--x: -1vmin;
					--y: 1vmin;
					--rz: 240deg;
				}
				&:nth-child(6) {
					--x: -1vmin;
					--rz: 300deg;
				}
			}
		}
	}
	.body-segment {
		transform: translate3d(-2.5vmin, -1.5vmin, -6vmin);
		.chunk {
			@include vars(14, 12, 8, 0, 0, 0, 0, 0, 0);
		}
		.chunk-small {
			@include vars(13, 11, 4, 0.5, 0.5, -4, 0, 0, 0);
		}
		.leg {
			@include vars(4, 7, 4, 0, 0, 0, 0, 0, 0);
			@include color(lighten(#9b3b6c, 3%));
		}
		.toes {
			width: 4vmin;
			transform: translatey(6.75vmin) translatez(1.5vmin);
		}
		.toe {
			@include vars(0.5, 2, 0.75, 0, 0, 0, 10, 0, 0);
		}
		.left-leg {
			transform-origin: 50% 100% 50%;
			transform: rotate(6deg) translate3d(1.5vmin, 10vmin, 0);
			.toe {
				@for $i from 1 through 4 {
					&:nth-child(#{$i}) {
						--x: calc((4.25vmin / 4) * (#{$i} - 1));
						--rx: calc(20deg / 4 * #{$i});
					}
				}
			}
		}
		.right-leg {
			transform-origin: 50% 100% 50%;
			transform: rotate(-6deg) translate3d(8.5vmin, 10vmin, 0);
			.toe {
				@for $i from 1 through 4 {
					&:nth-child(#{$i}) {
						--x: calc((4.25vmin / 4) * (#{$i} - 1));
						--rx: calc(20deg / 4 * (4 - #{$i}));
					}
				}
			}
		}
		&.ft {
			--delay: 0s;
		}
		&.ft_mid {
			--delay: 0s;
			transform: translate3d(-2.5vmin, -1.5vmin, -15vmin);
		}
		&.bk_mid {
			--delay: 0.25s;
			transform: translate3d(-2.5vmin, -1.5vmin, -24vmin);
		}
		&.bk {
			--delay: 0.25s;
			transform: translate3d(-2.5vmin, -1.5vmin, -32vmin);
			.chunk {
				@include vars(14, 12, 6, 0, 0.5, 0, 0, 0, 0);
			}
		}
	}
}

// Animating

:root {
	--ease: ease-in-out;
	--dur: 2s;
}

.head {
	animation: head-wiggle var(--dur) ease-in-out infinite alternate-reverse;
}

.leg-ani {
	&.forward {
		animation: swim var(--dur) var(--ease) var(--delay) infinite alternate;
		.toes {
			animation: swim-toes var(--dur) var(--ease) var(--delay) infinite alternate;
		}
	}
	&.reverse {
		animation: swim var(--dur) var(--ease) var(--delay) infinite alternate-reverse;
		.toes {
			animation: swim-toes var(--dur) var(--ease) var(--delay) infinite alternate-reverse;
		}
	}
}

.body-ani {
	width: 14vmin;
	&.forwards {
		animation: body-wiggle var(--dur) var(--ease) var(--delay) infinite alternate;
	}
	&.reverse {
		animation: body-wiggle var(--dur) var(--ease) var(--delay) infinite alternate-reverse;
	}
}

.particle-1 {
	@include vars(1,1,1,40,0,15);
	@include color(#2CD8D5);
}
.particle-2 {
	@include vars(1,1,1,30,-8,12);
	@include color(#2CD8D5);
}
.particle-3 {
	@include vars(1,1,1,20,-2,30);
	@include color(#2CD8D5);
}
.particle {
	animation: particle var(--dur) linear infinite;
}

@keyframes body-wiggle {
	from {
		transform: rotatey(-4deg);
	}
	to {
		transform: rotatey(4deg);
	}
}

@keyframes head-wiggle {
	from {
		transform: rotatey(-10deg)
	}
	to {
		transform: rotatey(10deg)
	}
}

@keyframes swim {
	from {
		transform: rotatex(20deg)
	}
	to {
		transform: rotatex(-20deg)
	}
}

@keyframes swim-toes {
	from {
		transform: translatey(6.75vmin) translatez(1.5vmin) rotatex(25deg);
	}
	to {
		transform: translatey(6.75vmin) translatez(1.5vmin) rotatex(-25deg);
	}
}

@keyframes particle {
	0% {
		transform: translatez(0px)
	}
	100% {
		transform: translatez(-65vmin);
	}
}
!

JS 

              
                
// Enable scene interaction

const scene = document.querySelector('.scene');

const rotation = [];
const startPos = [];
let scale = 1;

const start = event => {
	// get the rx and ry of scene
	let style = window.getComputedStyle(scene);
	rotation[0] = parseInt(style.getPropertyValue('--rx'));
	rotation[1] = parseInt(style.getPropertyValue('--ry'));
	// mouse starting position
	startPos[0] = event.clientX || event.touches[0].clientX;
	startPos[1] = event.clientY || event.touches[0].clientY;
};

const update = event => {
	if (startPos.length > 0) {
		// track changes to the x and y
		let x = (event.clientX || event.touches[0].clientX) - startPos[0];
		let y = (event.clientY || event.touches[0].clientY) - startPos[1];
		// update the scene
		scene.style.setProperty('--rx', rotation[0] - y + 'deg');
		scene.style.setProperty('--ry', rotation[1] + x + 'deg');
		// log output
		console.table({
			rx: `${rotation[0] - y}deg`,
			ry: `${rotation[1] - x}deg`
		});
	}
};

const end = event => {
	startPos.length = 0;
};

scene.addEventListener('touchstart', start, false);
scene.addEventListener('mousedown', start, false);
document.addEventListener('touchmove', update, false);
document.addEventListener('mousemove', update, false);
document.addEventListener('touchend', end, false);
document.addEventListener('mouseup', end, false);

// zoom in out on mouse wheel
scene.addEventListener('wheel', event => {
	event.preventDefault();
	scale += event.deltaY * -0.01;
	scale = scale > 3 ? 3 : scale < 0.25 ? 0.25 : scale;
	scene.style.setProperty('--scene-scale', scale);
}, { passive: false });
!
999px

Console