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About the <head>

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!
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CSS

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HTML 

              
                <!DOCTYPE html>
<html lang="en" class="no-js">
	<head>
		<meta charset="UTF-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:200,400|Montserrat:700" rel="stylesheet">
	</head>
	<body class="demo-1" data-page="home">
		<main class="main main--demo-1">
			<div class="content content--demo-1">
				<div class="hamburger js-hover">
					<div class="hamburger__line hamburger__line--01">
						<div class="hamburger__line-in hamburger__line-in--01"></div>
					</div>
					<div class="hamburger__line hamburger__line--02">
						<div class="hamburger__line-in hamburger__line-in--02"></div>
					</div>
					<div class="hamburger__line hamburger__line--03">
						<div class="hamburger__line-in hamburger__line-in--03"></div>
					</div>
					<div class="hamburger__line hamburger__line--cross01">
						<div class="hamburger__line-in hamburger__line-in--cross01"></div>
					</div>
					<div class="hamburger__line hamburger__line--cross02">
						<div class="hamburger__line-in hamburger__line-in--cross02"></div>
					</div>
				</div>
				<div class="demo-title demo-title--demo-1">Alloy!</div>
				<div class="global-menu">
					<div class="global-menu__wrap">
						<a class="global-menu__item global-menu__item--demo-1" href="#">Home</a>
						<a class="global-menu__item global-menu__item--demo-1" href="#">About</a>
						<a class="global-menu__item global-menu__item--demo-1" href="#">Products</a>
						<a class="global-menu__item global-menu__item--demo-1" href="#">Contact</a>
					</div>
				</div>
				<svg class="shape-overlays" viewBox="0 0 100 100" preserveAspectRatio="none">
					<path class="shape-overlays__path"></path>
					<path class="shape-overlays__path"></path>
					<path class="shape-overlays__path"></path>
				</svg>
			</div>
		</main>
	</body>
</html>
!

CSS 

              
                *,
*::after,
*::before {
	box-sizing: border-box;
}

html {
	background: #000;
}

body {
	font-family: 'Source Sans Pro', Avenir, 'Helvetica Neue', Helvetica, Arial, sans-serif;
	min-height: 100vh;
	color: #57585c;
	color: var(--color-text);	
	background-color: #fff;
	background-color: var(--color-bg);
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

/* Color schemes */
.demo-1 {
	--color-text: #fff;
	--color-bg: #ddd;
	--color-link: #fff;
	--color-link-hover: #2735da;
	--color-info: #fff;
	--color-main-bg: #171619;
	--path-fill-1: #413f46;
	--path-fill-2: #e6e5ea;
	--path-fill-3: #ccc;
	--color-title: #fff;
	--font-family-title: 'Montserrat', sans-serif;
	--font-size-title: 7vmax;
	--font-weight-title: 700;
	--color-menu: #171616;
	--color-menu-hover: #ffffff;
	--font-family-menu: 'Montserrat', sans-serif;
	--font-size-menu: 3vmax;
	--font-weight-menu: 700;
	--button-bg: #fff;
	--button-circle: #6b6b6b;
	--button-line: #222;
}

a {
	text-decoration: none;
	color: #5d93d8;
	color: var(--color-link);
	outline: none;
}

a:hover,
a:focus {
	color: #423c2b;
	color: var(--color-link-hover);
	outline: none;
}

main {
	position: relative;
	width: 100%;
	min-height: 100vh;
	background-color: var(--color-main-bg);
}

.content {
	position: relative;
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	margin: 0 auto;
	pointer-events: none;
}

.demo-title {
	color: var(--color-title);
	font-family: var(--font-family-title);
	font-size: var(--font-size-title);
	font-weight: var(--font-weight-title);
}

.global-menu {
	width: 100vw;
	height: 90vh;
	display: flex;
	justify-content: center;
	align-items: center;
	position: fixed;
	top: 0;
	left: 0;
	pointer-events: none;
	z-index: 100;
}

.global-menu__item {
	color: var(--color-menu);
	font-family: var(--font-family-menu);
	font-size: var(--font-size-menu);
	font-weight: var(--font-weight-menu);
	opacity: 0;
	transform: translateY(-100%);
	pointer-events: none;
	display: block;
	margin: 0.25em 0;
	transition: transform 0.3s, opacity 0.3s;
	transition-timing-function: ease-in;
}

.global-menu__item:hover {
	color: var(--color-menu-hover);
}

.global-menu__item.is-opened {
	opacity: 1;
	transform: translateY(0) rotate(0);
	pointer-events: auto;
	transition-timing-function: ease;
}

.global-menu__item:nth-of-type(1) {
	transition-delay: 0s;
}

.global-menu__item.is-opened:nth-of-type(1) {
	transition-delay: 0.85s;
}

.global-menu__item:nth-of-type(2) {
	transition-delay: 0.05s;
}

.global-menu__item.is-opened:nth-of-type(2) {
	transition-delay: 0.8s;
}

.global-menu__item:nth-of-type(3) {
	transition-delay: 0.1s;
}

.global-menu__item.is-opened:nth-of-type(3) {
	transition-delay: 0.75s;
}

.global-menu__item:nth-of-type(4) {
	transition-delay: 0.15s;
}

.global-menu__item.is-opened:nth-of-type(4) {
	transition-delay: 0.7s;
}

.shape-overlays {
	width: 100vw;
	height: 100vh;
	pointer-events: none;
	position: fixed;
	top: 0;
	left: 0;
}

.shape-overlays.is-opened {
	pointer-events: auto;
}

.shape-overlays__path:nth-of-type(1) {
	fill: var(--path-fill-1);
}

.shape-overlays__path:nth-of-type(2) {
	fill: var(--path-fill-2);
}

.shape-overlays__path:nth-of-type(3) {
	fill: var(--path-fill-3);
}

.shape-overlays__path:nth-of-type(4) {
	fill: var(--path-fill-4);
}

@-webkit-keyframes intervalHamburgerBorder {
	0% {
		opacity: 1;
		-webkit-transform: scale(1);
		transform: scale(1);
	}
	80% {
		-webkit-transform: scale(1.6);
		transform: scale(1.6);
	}
	100% {
		opacity: 0;
		-webkit-transform: scale(1.6);
		transform: scale(1.6);
	}
}

@keyframes intervalHamburgerBorder {
	0% {
		opacity: 1;
		-webkit-transform: scale(1);
		transform: scale(1);
	}
	80% {
		-webkit-transform: scale(1.6);
		transform: scale(1.6);
	}
	100% {
		opacity: 0;
		-webkit-transform: scale(1.6);
		transform: scale(1.6);
	}
}

.hamburger {
	width: 64px;
	height: 64px;
	display: block;
	position: relative;
	cursor: pointer;
	position: absolute;
	top: 2.25em;
	right: 2.25em;
	z-index: 110;
	border-radius: 50%;
	background-color: var(--button-bg);
	pointer-events: auto;
	-webkit-tap-highlight-color: rgba(0,0,0,0);
}

.hamburger::after {
	width: 64px;
	height: 64px;
	box-sizing: border-box;
	content: '';
	display: block;
	position: absolute;
	top: 0;
	left: 0;
	pointer-events: none;
	border: 4px solid var(--button-circle);
	border-radius: 50%;
	-webkit-animation-duration: 1.2s;
	animation-duration: 1.2s;
	-webkit-animation-name: intervalHamburgerBorder;
	animation-name: intervalHamburgerBorder;
	-webkit-animation-iteration-count: infinite;
	animation-iteration-count: infinite;
}

.hamburger__line {
	width: 28px;
	height: 2px;
	overflow: hidden;
	position: absolute;
	z-index: 10;
}

.hamburger__line-in {
	width: 84px;
	height: 2px;
	position: absolute;
	top: 0;
	left: 0;
}

.hamburger__line-in::before,
.hamburger__line-in::after {
	width: 28px;
	height: 2px;
	content: '';
	display: block;
	position: absolute;
	top: 0;
	background-color: var(--button-line);
}

.hamburger__line-in::before {
	left: -56px;
}

.hamburger__line-in::after {
	left: 0;
}

.hamburger__line--01,
.hamburger__line--02,
.hamburger__line--03,
.hamburger__line--cross01,
.hamburger__line--cross02 {
	left: 18px;
}

.hamburger__line--01 {
	top: 24.6px;
}

.hamburger__line--02,
.hamburger__line--cross01,
.hamburger__line--cross02 {
	top: 31px;
}

.hamburger__line--03 {
	top: 37.4px;
}

.hamburger__line--cross01 {
	-webkit-transform: rotate(45deg);
	transform: rotate(45deg);
}

.hamburger__line--cross02 {
	-webkit-transform: rotate(-45deg);
	transform: rotate(-45deg);
}

.hamburger__line {
	-webkit-transition-duration: 0.6s;
	transition-duration: 0.6s;
	-webkit-transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
	transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
}

.hamburger__line-in {
	-webkit-transition-duration: 0.6s;
	transition-duration: 0.6s;
	-webkit-transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
	transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
}

.hamburger__line-in::before,
.hamburger__line-in::after {
	-webkit-transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
	transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
	-webkit-transition-property: -webkit-transform;
	transition-property: -webkit-transform;
	transition-property: transform;
	transition-property: transform, -webkit-transform;
}

.hamburger__line-in--cross01,
.hamburger__line-in--cross02 {
	-webkit-transform: translateX(-33.3%);
	transform: translateX(-33.3%);
}

.hamburger__line-in--01 {
	-webkit-transition-delay: 0.2s;
	transition-delay: 0.2s;
}

.hamburger__line-in--02 {
	-webkit-transition-delay: 0.25s;
	transition-delay: 0.25s;
}

.hamburger__line-in--02::before,
.hamburger__line-in--02::after {
	-webkit-transition-delay: 0.05s;
	transition-delay: 0.05s;
}

.hamburger__line-in--03 {
	-webkit-transition-delay: 0.3s;
	transition-delay: 0.3s;
}

.hamburger__line-in--03::before,
.hamburger__line-in--03::after {
	-webkit-transition-delay: 0.1s;
	transition-delay: 0.1s;
}

.hamburger__line-in--cross01 {
	-webkit-transition-delay: 0.0s;
	transition-delay: 0.0s;
}

.hamburger__line-in--cross02 {
	-webkit-transition-delay: 0.05s;
	transition-delay: 0.05s;
}

.hamburger__line-in--cross02::before,
.hamburger__line-in--cross02::after {
	-webkit-transition-delay: 0.1s;
	transition-delay: 0.1s;
}

.hamburger.is-opened-navi .hamburger__line-in--01,
.hamburger.is-opened-navi .hamburger__line-in--02,
.hamburger.is-opened-navi .hamburger__line-in--03 {
	-webkit-transform: translateX(33.3%);
	transform: translateX(33.3%);
}

.hamburger.is-opened-navi .hamburger__line-in--cross01,
.hamburger.is-opened-navi .hamburger__line-in--cross02 {
	-webkit-transform: translateX(0);
	transform: translateX(0);
}

.hamburger.is-opened-navi .hamburger__line-in--01 {
	-webkit-transition-delay: 0s;
	transition-delay: 0s;
}

.hamburger.is-opened-navi .hamburger__line-in--02 {
	-webkit-transition-delay: 0.05s;
	transition-delay: 0.05s;
}

.hamburger.is-opened-navi .hamburger__line-in--03 {
	-webkit-transition-delay: 0.1s;
	transition-delay: 0.1s;
}

.hamburger.is-opened-navi .hamburger__line-in--cross01 {
	-webkit-transition-delay: 0.25s;
	transition-delay: 0.25s;
}

.hamburger.is-opened-navi .hamburger__line-in--cross02 {
	-webkit-transition-delay: 0.3s;
	transition-delay: 0.3s;
}

.hamburger:hover .hamburger__line-in::before,
.hamburger:hover .hamburger__line-in::after {
	-webkit-transform: translateX(200%);
	transform: translateX(200%);
}

.hamburger:hover .hamburger__line-in--01::before,
.hamburger:hover .hamburger__line-in--01::after,
.hamburger:hover .hamburger__line-in--02::before,
.hamburger:hover .hamburger__line-in--02::after,
.hamburger:hover .hamburger__line-in--03::before,
.hamburger:hover .hamburger__line-in--03::after {
	-webkit-transition-duration: 1s;
	transition-duration: 1s;
}

.hamburger:hover .hamburger__line-in--cross01::before,
.hamburger:hover .hamburger__line-in--cross01::after,
.hamburger:hover .hamburger__line-in--cross02::before,
.hamburger:hover .hamburger__line-in--cross02::after {
	-webkit-transition-duration: 0s;
	transition-duration: 0s;
}

.hamburger.is-opened-navi:hover .hamburger__line-in--cross01::before,
.hamburger.is-opened-navi:hover .hamburger__line-in--cross01::after,
.hamburger.is-opened-navi:hover .hamburger__line-in--cross02::before,
.hamburger.is-opened-navi:hover .hamburger__line-in--cross02::after {
	-webkit-transition-duration: 1s;
	transition-duration: 1s;
}

.hamburger.is-opened-navi:hover .hamburger__line-in--01::before,
.hamburger.is-opened-navi:hover .hamburger__line-in--01::after,
.hamburger.is-opened-navi:hover .hamburger__line-in--02::before,
.hamburger.is-opened-navi:hover .hamburger__line-in--02::after,
.hamburger.is-opened-navi:hover .hamburger__line-in--03::before,
.hamburger.is-opened-navi:hover .hamburger__line-in--03::after {
	-webkit-transition-duration: 0s;
	transition-duration: 0s;
}

@media screen and (max-width: 55em) {
	html,
	body {
		overflow-x: hidden;
		width: 100vw;
		height: 100%;
	}
	.hamburger {
		position: fixed;
		top: 0.5em;
		right: 0.5em;
		transform: scale(0.75);
	}
	.content {
		height: auto;
		min-height: 0;
		padding-bottom: 10em;
		flex-direction: column;
	}
!

JS 

              
                /**
 * Inspired by:
 * http://www.codrops.com
 */

var pages = ["home","info", "contact"];

class ShapeOverlays {
  constructor(elm) {
    this.elm = elm;
    this.path = elm.querySelectorAll('path');
    this.numPoints = 18;
    this.duration = 600;
    this.delayPointsArray = [];
    this.delayPointsMax = 300;
    this.delayPerPath = 100;
    this.timeStart = Date.now();
    this.isOpened = false;
    this.isAnimating = false;
  }
  toggle() {
    this.isAnimating = true;
    const range = 4 * Math.random() + 6;
    for (var i = 0; i < this.numPoints; i++) {
      const radian = i / (this.numPoints - 1) * Math.PI;
      this.delayPointsArray[i] = (Math.sin(-radian) + Math.sin(-radian * range) + 2) / 4 * this.delayPointsMax;
    }
    if (this.isOpened === false) {
      this.open();
    } else {
      this.close();
    }
  }
  open() {
    this.isOpened = true;
    this.elm.classList.add('is-opened');
    this.timeStart = Date.now();
    this.renderLoop();
  }
  close() {
    this.isOpened = false;
    this.elm.classList.remove('is-opened');
    this.timeStart = Date.now();
    this.renderLoop();
  }
  updatePath(time) {
    const points = [];
    for (var i = 0; i < this.numPoints + 1; i++) {
      points[i] = ease.cubicInOut(Math.min(Math.max(time - this.delayPointsArray[i], 0) / this.duration, 1)) * 100
    }

    let str = '';
    str += (this.isOpened) ? `M 0 0 V ${points[0]} ` : `M 0 ${points[0]} `;
    for (var i = 0; i < this.numPoints - 1; i++) {
      const p = (i + 1) / (this.numPoints - 1) * 100;
      const cp = p - (1 / (this.numPoints - 1) * 100) / 2;
      str += `C ${cp} ${points[i]} ${cp} ${points[i + 1]} ${p} ${points[i + 1]} `;
    }
    str += (this.isOpened) ? `V 0 H 0` : `V 100 H 0`;
    return str;
  }
  render() {
    if (this.isOpened) {
      for (var i = 0; i < this.path.length; i++) {
        this.path[i].setAttribute('d', this.updatePath(Date.now() - (this.timeStart + this.delayPerPath * i)));
      }
    } else {
      for (var i = 0; i < this.path.length; i++) {
        this.path[i].setAttribute('d', this.updatePath(Date.now() - (this.timeStart + this.delayPerPath * (this.path.length - i - 1))));
      }
    }
  }
  renderLoop() {
    this.render();
    if (Date.now() - this.timeStart < this.duration + this.delayPerPath * (this.path.length - 1) + this.delayPointsMax) {
      requestAnimationFrame(() => {
        this.renderLoop();
      });
    }
    else {
      this.isAnimating = false;
    }
  }
}

(function() {
  const elmHamburger = document.querySelector('.hamburger');
  const elmOverlay = document.querySelector('.shape-overlays');
  const overlay = new ShapeOverlays(elmOverlay);

  elmHamburger.addEventListener('click', () => {
    if (overlay.isAnimating) {
      return false;
    }
    overlay.toggle();
  });
  
  document.addEventListener('wheel', () => {
    if (overlay.isAnimating) {
      return false;
    }
    overlay.toggle();
  });
}());























//
// these easing functions are based on the code of glsl-easing module.
// https://github.com/glslify/glsl-easings
//

const ease = {
  exponentialIn: (t) => {
    return t == 0.0 ? t : Math.pow(2.0, 10.0 * (t - 1.0));
  },
  exponentialOut: (t) => {
    return t == 1.0 ? t : 1.0 - Math.pow(2.0, -10.0 * t);
  },
  exponentialInOut: (t) => {
    return t == 0.0 || t == 1.0
      ? t
      : t < 0.5
        ? +0.5 * Math.pow(2.0, (20.0 * t) - 10.0)
        : -0.5 * Math.pow(2.0, 10.0 - (t * 20.0)) + 1.0;
  },
  sineOut: (t) => {
    const HALF_PI = 1.5707963267948966;
    return Math.sin(t * HALF_PI);
  },
  circularInOut: (t) => {
    return t < 0.5
        ? 0.5 * (1.0 - Math.sqrt(1.0 - 4.0 * t * t))
        : 0.5 * (Math.sqrt((3.0 - 2.0 * t) * (2.0 * t - 1.0)) + 1.0);
  },
  cubicIn: (t) => {
    return t * t * t;
  },
  cubicOut: (t) => {
    const f = t - 1.0;
    return f * f * f + 1.0;
  },
  cubicInOut: (t) => {
    return t < 0.5
      ? 4.0 * t * t * t
      : 0.5 * Math.pow(2.0 * t - 2.0, 3.0) + 1.0;
  },
  quadraticOut: (t) => {
    return -t * (t - 2.0);
  },
  quarticOut: (t) => {
    return Math.pow(t - 1.0, 3.0) * (1.0 - t) + 1.0;
  },
}
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