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HTML

              
                <body class="loading">
		<svg class="hidden">
			<symbol id="icon-arrow" viewBox="0 0 24 24">
				<title>arrow</title>
				<polygon points="6.3,12.8 20.9,12.8 20.9,11.2 6.3,11.2 10.2,7.2 9,6 3.1,12 9,18 10.2,16.8 "/>
			</symbol>
			<symbol id="icon-drop" viewBox="0 0 24 24">
				<title>drop</title>
				<path d="M12,21c-3.6,0-6.6-3-6.6-6.6C5.4,11,10.8,4,11.4,3.2C11.6,3.1,11.8,3,12,3s0.4,0.1,0.6,0.3c0.6,0.8,6.1,7.8,6.1,11.2C18.6,18.1,15.6,21,12,21zM12,4.8c-1.8,2.4-5.2,7.4-5.2,9.6c0,2.9,2.3,5.2,5.2,5.2s5.2-2.3,5.2-5.2C17.2,12.2,13.8,7.3,12,4.8z"/><path d="M12,18.2c-0.4,0-0.7-0.3-0.7-0.7s0.3-0.7,0.7-0.7c1.3,0,2.4-1.1,2.4-2.4c0-0.4,0.3-0.7,0.7-0.7c0.4,0,0.7,0.3,0.7,0.7C15.8,16.5,14.1,18.2,12,18.2z"/>
			</symbol>
			<svg id="icon-github" viewBox="0 0 33 33">
				<title>github</title>
				<path d="M16.608.455C7.614.455.32 7.748.32 16.745c0 7.197 4.667 13.302 11.14 15.456.815.15 1.112-.353 1.112-.785 0-.386-.014-1.411-.022-2.77-4.531.984-5.487-2.184-5.487-2.184-.741-1.882-1.809-2.383-1.809-2.383-1.479-1.01.112-.99.112-.99 1.635.115 2.495 1.679 2.495 1.679 1.453 2.489 3.813 1.77 4.741 1.353.148-1.052.569-1.77 1.034-2.177-3.617-.411-7.42-1.809-7.42-8.051 0-1.778.635-3.233 1.677-4.371-.168-.412-.727-2.069.16-4.311 0 0 1.367-.438 4.479 1.67a15.602 15.602 0 0 1 4.078-.549 15.62 15.62 0 0 1 4.078.549c3.11-2.108 4.475-1.67 4.475-1.67.889 2.242.33 3.899.163 4.311C26.37 12.66 27 14.115 27 15.893c0 6.258-3.809 7.635-7.437 8.038.584.503 1.105 1.497 1.105 3.017 0 2.177-.02 3.934-.02 4.468 0 .436.294.943 1.12.784 6.468-2.159 11.131-8.26 11.131-15.455 0-8.997-7.294-16.29-16.291-16.29"></path>
			</svg>
			<symbol id="icon-menu" viewBox="0 0 119 25">
				<title>menu</title>
				<path d="M36,8 L36,0 L100,0 L100,8 L36,8 Z M0,8 L0,0 L24,0 L24,8 L0,8 Z M0,28 L0,20 L71,20 L71,28 L0,28 Z"/>
			</symbol>
			<symbol id="icon-close" viewBox="0 0 24 24">
				<title>close</title>
				<path d="M24 1.485L22.515 0 12 10.515 1.485 0 0 1.485 10.515 12 0 22.515 1.485 24 12 13.484 22.515 24 24 22.515 13.484 12z"/>
			</symbol>
		</svg>
		<main>
			<div class="frame">
				<header class="codrops-header">
					<!-- <div class="codrops-links">
						<a class="codrops-icon codrops-icon--prev" href="https://tympanus.net/Development/GridLayoutScrollableContent/" title="Previous Demo"><svg class="icon icon--arrow"><use xlink:href="#icon-arrow"></use></svg></a>
						<a class="codrops-icon codrops-icon--drop" href="https://tympanus.net/codrops/?p=36043" title="Back to the article"><svg class="icon icon--drop"><use xlink:href="#icon-drop"></use></svg></a>
					</div> -->
					<h1 class="codrops-header__title">Multibox Menu</h1>
				</header>
				<!-- <p class="info">12 &mdash; 24 May 2019 &middot; Bannockburn &middot; Stirling &middot; UK</p> -->
				<a class="github" href="#" title="Find this project on GitHub"><svg class="icon icon--github"><use xlink:href="#icon-github"></use></svg></a>
			</div>
			<div class="content">
				<div class="background"></div>
				<h2 class="content__title">Headline</h2>
				<p class="content__tagline">Subheadline</p>
			</div>
			<nav class="menu">
				<div class="menu__item menu__item--1" data-direction="bt">
					<div class="menu__item-inner">
						<div class="mainmenu">
							<a href="#" class="mainmenu__item">About</a>
							<a href="#" class="mainmenu__item">Team</a>
							<a href="#" class="mainmenu__item">Services</a>
							<a href="#" class="mainmenu__item">Contact</a>
						</div>
						<p class="label label--topleft label--vert-mirror">the important stuff</p>
						<p class="label label--bottomright label--vert">made in charleston</p>
					</div>
				</div>
				<div class="menu__item menu__item--2" data-direction="lr">
					<div class="menu__item-inner">
						<div class="menu__item-map"></div>
						<a href="#" class="menu__item-hoverlink">The location</a>
					</div>
				</div>
				<div class="menu__item menu__item--3" data-direction="bt">
					<div class="menu__item-inner">
						<div class="sidemenu">
							<a href="#" class="sidemenu__item"><span class="sidemenu__item-inner">Link 1</span></a>
							<a href="#" class="sidemenu__item"><span class="sidemenu__item-inner">Link 2</span></a>
							<a href="#" class="sidemenu__item"><span class="sidemenu__item-inner">Link 3</span></a>
							<a href="#" class="sidemenu__item"><span class="sidemenu__item-inner">Link 4</span></a>
						</div>
					</div>
				</div>
				<div class="menu__item menu__item--4" data-direction="rl">
					<div class="menu__item-inner">
						<p class="label label--topleft label--line">Call to Action</p>
						<a href="#" class="menu__item-link">Learn how to <br> participate</a>
					</div>
				</div>
				<div class="menu__item menu__item--5" data-direction="tb">
					<div class="menu__item-inner">
						<p class="quote">Business intelligence (BI) is a technology-driven process for analyzing data and presenting actionable information to help executives, managers and other corporate end users make informed business decisions.</p>
					</div>
				</div>
				<button class="action action--menu"><svg class="icon icon--menu"><use xlink:href="#icon-menu"></use></svg></button>
				<button class="action action--close"><svg class="icon icon--close"><use xlink:href="#icon-close"></use></svg></button>
			</nav>
		</main>
	</body>
              
            
!

CSS

              
                article, aside, details, figcaption, figure, footer, header, hgroup, main, nav, section, summary {
  display: block;
}

audio, canvas, video {
  display: inline-block;
}

audio:not([controls]) {
  display: none;
  height: 0;
}

[hidden] {
  display: none;
}

html {
  font-family: sans-serif;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
}

a:focus {
  outline: thin dotted;
}

a:active, a:hover {
  outline: 0;
}

h1 {
  font-size: 2em;
  margin: 0.67em 0;
}

abbr[title] {
  border-bottom: 1px dotted;
}

b, strong {
  font-weight: bold;
}

dfn {
  font-style: italic;
}

hr {
  -moz-box-sizing: content-box;
  box-sizing: content-box;
  height: 0;
}

mark {
  background: #ff0;
  color: #000;
}

code, kbd, pre, samp {
  font-family: monospace, serif;
  font-size: 1em;
}

pre {
  white-space: pre-wrap;
}

q {
  quotes: "\201C""\201D""\2018""\2019";
}

small {
  font-size: 80%;
}

sub, sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sup {
  top: -0.5em;
}

sub {
  bottom: -0.25em;
}

img {
  border: 0;
}

svg:not(:root) {
  overflow: hidden;
}

figure {
  margin: 0;
}

fieldset {
  border: 1px solid #c0c0c0;
  margin: 0 2px;
  padding: 0.35em 0.625em 0.75em;
}

legend {
  border: 0;
  padding: 0;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 100%;
  margin: 0;
}

button, input {
  line-height: normal;
}

button, select {
  text-transform: none;
}

button, html input[type="button"], input[type="reset"], input[type="submit"] {
  -webkit-appearance: button;
  cursor: pointer;
}

button[disabled], html input[disabled] {
  cursor: default;
}

input[type="checkbox"], input[type="radio"] {
  box-sizing: border-box;
  padding: 0;
}

input[type="search"] {
  -webkit-appearance: textfield;
  -moz-box-sizing: content-box;
  -webkit-box-sizing: content-box;
  box-sizing: content-box;
}

input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}

button::-moz-focus-inner, input::-moz-focus-inner {
  border: 0;
  padding: 0;
}

textarea {
  overflow: auto;
  vertical-align: top;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

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

body {
  --color-text: #fff;
  --color-bg: #252525;
  --color-link: #fff;
  --color-link-hover: #bed9e8;
  --color-bg-item1: #15171b;
  --color-bg-item2: #2c35b7;
  --color-bg-item3: #0f1013;
  --color-bg-item4: #1d2027;
  --color-bg-item5: #0f1013;
  --color-item-alt: #494d54;
  --color-quote: #5b677a;
  --color-info: #57535a;
  --color-title: #bed9e8;
  --color-tagline: #e2e2e2;
  font-family: "europa", Futura, Arial, sans-serif;
  min-height: 100vh;
  color: #57585c;
  color: var(--color-text);
  background-color: #fff;
  background-color: var(--color-bg);
  overflow: hidden;
  padding: 6rem 0 0 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Page Loader */
.js .loading::before {
  content: '';
  position: fixed;
  z-index: 100000;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg);
}

.js .loading::after {
  content: '';
  position: fixed;
  z-index: 100000;
  top: 50%;
  left: 50%;
  width: 60px;
  height: 60px;
  margin: -30px 0 0 -30px;
  pointer-events: none;
  border-radius: 50%;
  opacity: 0.4;
  background: var(--color-link);
  animation: loaderAnim 0.7s linear infinite alternate forwards;
}

@keyframes loaderAnim {
  to {
    opacity: 1;
    transform: scale3d(0.5, 0.5, 1);
  }
}

a {
  text-decoration: none;
  color: var(--color-link);
  outline: none;
  transition: color 0.2s;
}

a:hover,
a:focus {
  color: var(--color-link-hover);
}

button:focus,
a:focus {
  outline: none;
}

.hidden {
  position: absolute;
  overflow: hidden;
  width: 0;
  height: 0;
  pointer-events: none;
}

/* Icons */
.icon {
  display: block;
  width: 1.5em;
  height: 1.5em;
  margin: 0 auto;
  fill: currentColor;
}

main {
  position: relative;
  width: 100%;
}

.frame {
  position: relative;
  z-index: 199;
}

.content {
  text-align: center;
  position: relative;
  z-index: 100;
}

.background {
  perspective: 1000px;
}

.background,
.background__copy {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background:
    linear-gradient(rgba(0, 0, 0, 0.75),
    rgba(0, 0, 0, 0.75)),
    url(../img/is-bg.jpg);
  background-position: 50% 0%;
  background-size: cover;
  z-index: 1;
}

.background__copy {
  opacity: 0.3;
  transform: translate3d(0, 0, 0);
}

/* Header */
.codrops-header {
  position: relative;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  justify-items: center;
  align-self: start;
}

.codrops-header__title {
  font-size: 1rem;
  line-height: 1;
  font-weight: normal;
  margin: 0 1rem;
}

.info {
  display: block;
  grid-area: info;
  margin: 1rem 0;
  justify-self: end;
  text-align: center;
}

.github {
  display: block;
  margin: 1rem 0 0 0;
}

/* Top Navigation Style */
.codrops-links {
  position: relative;
  display: flex;
  justify-content: center;
  text-align: center;
  white-space: nowrap;
  font-size: 0.85rem;
}

.codrops-icon {
  display: inline-block;
  padding: 0.25em;
}

.content__title {
  /* font-family: "sabbath-black", serif; */
  font-family: "europa", Futura, Arial, serif;
  font-size: 14vw;
  font-weight: normal;
  mix-blend-mode: screen;
  line-height: 0.8;
  text-transform: lowercase;
  margin: 0;
  color: var(--color-title);
  z-index: 199;
  cursor: default;
}

.content__tagline {
  color: var(--color-tagline);
  margin: 1rem 0 0 0;
  font-weight: bold;
  font-size: 1rem;
  letter-spacing: 0.125rem;
  word-spacing: 0.25rem;
  text-transform: uppercase;
  text-align: center;
  z-index: 199;
  cursor: default;
}

.action {
  background: none;
  border: 0;
  color: #fff;
  cursor: pointer;
  padding: 0;
}

.action--menu {
  pointer-events: auto;
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
}

.menu--open .action--menu {
  pointer-events: none;
}

.action--close {
  position: absolute;
  top: 1.5rem;
  right: 1.75rem;
  z-index: 1000;
  opacity: 0;
  padding: 0 0.5rem;
}

.icon--menu {
  width: 2rem;
}

.icon--close {
  width: 1rem;
}

.menu {
  text-align: center;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  display: grid;
  grid-template-columns: 100%;
  grid-template-rows: repeat(3, 33.33%);
  pointer-events: none;
}

.menu--open {
  pointer-events: auto;
}

.menu__item {
  width: 100%;
  position: relative;
  overflow: hidden;
}

.menu__item-inner {
  overflow: hidden;
  transform: translate3d(100%, 0, 0);
  height: 100%;
  width: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.menu__item--1 .menu__item-inner {
  background: var(--color-bg-item1);
}

.menu__item--2 .menu__item-inner {
  background: var(--color-bg-item2);
}

.menu__item--3 .menu__item-inner {
  background: var(--color-bg-item3);
}

.menu__item--4 .menu__item-inner {
  background: var(--color-bg-item4);
}

.menu__item--5 .menu__item-inner {
  background: var(--color-bg-item5);
}

.menu__item--4,
.menu__item--5 {
  display: none;
}

.label {
  display: none;
}

.mainmenu__item {
  opacity: 0;
}

.mainmenu__item,
.sidemenu__item {
  position: relative;
  overflow: hidden;
  transition: color 0.1s;
  margin: 0.25rem 0;
  display: block;
}

.sidemenu__item-inner {
  display: block;
  transform: translate3d(0, 100%, 0);
}

.menu__item-map {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background: url(../img/chs-old-map.jpeg) no-repeat 50% 50%;
  background-size: cover;
  transition: transform 0.8s cubic-bezier(0.2, 1, 0.8, 1);
}

.menu__item-inner:hover .menu__item-map {
  transform: scale3d(1.1, 1.1, 1);
}

.menu__item-hoverlink {
  font-weight: bold;
  text-transform: capitalize;
  position: relative;
  z-index: 1000;
  display: block;
}

.menu__item-hoverlink:hover {
  color: var(--color-link);
}

.quote {
  font-size: 1.5rem;
  padding: 1rem;
  text-align: center;
  max-width: 70%;
  color: var(--color-quote);
  /* font-family: "sabbath-black",serif; */
  font-family: "europa", Futura, Arial, serif;
}

.menu__item-link {
  text-align: left;
  align-self: flex-start;
  justify-self: start;
  font-size: 1.5rem;
  width: 100%;
  line-height: 1;
  padding: 2rem;
  margin: 3rem 0 auto;
  display: flex;
  flex-direction: column;
  height: calc(100% - 3rem);
}

.menu__item-link::after {
  content: '\27F6';
  display: block;
  margin-top: auto;
  font-size: 0.95rem;
}

@media screen and (min-width: 53em) {
  body {
    padding: 0;
  }

  .content {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
    min-height: 100vh;
    text-align: left;
  }

  .frame {
    position: fixed;
    z-index: 199;
    top: 0;
    left: 0;
    display: grid;
    align-content: space-between;
    width: 100%;
    max-width: none;
    height: 100vh;
    padding: 1.5rem;
    pointer-events: none;
    grid-template-columns: 50% 50%;
    grid-template-rows: auto auto auto;
    grid-template-areas:
      'codropsheader info'
      '... ...'
      'github ...';
  }

  .codrops-header {
    grid-area: codropsheader;
    padding: 0;
    justify-content: start;
  }

  .codrops-links {
    margin: 0;
  }

  .frame a {
    pointer-events: auto;
  }

  .github {
    grid-area: github;
    justify-self: start;
  }

  .info {
    margin: 0 6rem 0 0;
    color: var(--color-info);
  }

  .menu {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    position: fixed;
    top: 0;
    left: 0;
    grid-template-columns: 20% 30% 50%;
    grid-template-rows: 60% 40%;
    grid-template-areas:
      "item3 item2 item1"
      "item4 item5 item1";
  }

  .menu__item {
    height: 100%;
  }

  .menu__item--1 {
    grid-area: item1;
  }

  .menu__item--2 {
    grid-area: item2;
  }

  .menu__item--3 {
    grid-area: item3;
  }

  .menu__item--4 {
    grid-area: item4;
  }

  .menu__item--5 {
    grid-area: item5;
  }

  .menu__item--4,
  .menu__item--5 {
    display: block;
  }

  .menu__item-inner {
    align-items: center;
  }

  .label {
    display: block;
    color: var(--color-item-alt);
    position: absolute;
    z-index: 1000;
    font-size: 0.85rem;
    font-weight: bold;
    margin: 0;
    white-space: nowrap;
  }

  .label--topleft {
    top: 2rem;
    left: 2rem;
  }

  .label--vert,
  .label--vert-mirror {
    -webkit-writing-mode: vertical-rl;
    writing-mode: vertical-rl;
  }

  .label--vert-mirror {
    transform: rotate(180deg);
  }

  .label--bottomright {
    bottom: 2rem;
    right: 2rem;
  }

  .label::before {
    content: '------------- ';
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -1px;
    margin: 0 0.75rem 0 0;
  }

  .label--vert::before,
  .label--vert-mirror::before {
    margin: 0.75rem 0;
  }

  .mainmenu,
  .sidemenu {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .mainmenu {
    counter-reset: menuitem;
  }

  .mainmenu__item {
    font-size: 5vw;
    text-transform: lowercase;
    overflow: visible;
    margin: 0.5rem 0;
    padding: 0 0.5rem;
    position: relative;
    transition: color 0.3s;
  }

  .mainmenu__item:hover {
    color: var(--color-item-alt);
  }

  .mainmenu__item::before {
    counter-increment: menuitem;
    content: counters(menuitem, "", decimal-leading-zero);
    position: absolute;
    font-size: 0.85rem;
    top: 25%;
    left: -1.25rem;
    color: var(--color-item-alt);
  }

  .mainmenu__item::after {
    content: '';
    width: 100%;
    top: 58%;
    height: 6px;
    background: var(--color-link-hover);
    position: absolute;
    left: 0;
    opacity: 0;
    transform: scale3d(0, 1, 1);
    transition: transform 0.3s, opacity 0.3s;
    transform-origin: 100% 50%;
  }

  .mainmenu__item:hover::after {
    opacity: 1;
    transform: scale3d(1, 1, 1);
  }

  .sidemenu__item {
    text-transform: uppercase;
    letter-spacing: 0.15rem;
    font-size: 0.85rem;
  }

  .menu__item-hoverlink {
    font-size: 1.25rem;
    text-transform: lowercase;
    border-bottom: 2px solid #fff;
    opacity: 0;
    transition: opacity 0.3s;
  }

  .menu__item-inner:hover .menu__item-hoverlink {
    opacity: 1;
  }
}
              
            
!

JS

              
                {
    // Class Menu.
    class Menu {
        constructor(el) {
            this.DOM = {el: el};
            // Open and close ctls.
            this.DOM.openCtrl = this.DOM.el.querySelector('.action--menu');
            this.DOM.closeCtrl = this.DOM.el.querySelector('.action--close');
            this.DOM.openCtrl.addEventListener('click', () => this.open());
            this.DOM.closeCtrl.addEventListener('click', () => this.close());
            this.DOM.openCtrl.addEventListener('mouseenter', () => {
                allowTilt = false;
                tilt.reset()
            });
            this.DOM.openCtrl.addEventListener('mouseleave', () => {
                allowTilt = true;
            });

            // The menu items.
            this.DOM.items = Array.from(this.DOM.el.querySelectorAll('.menu__item'));
            // The total number of items.
            this.itemsTotal = this.DOM.items.length;

            // Custom elements that will be animated.
            this.DOM.mainLinks = this.DOM.el.querySelectorAll('.mainmenu > a.mainmenu__item');
            this.DOM.sidemenuLinks = this.DOM.el.querySelectorAll('.sidemenu span.sidemenu__item-inner');
            this.DOM.menulink = this.DOM.el.querySelector('.menu__item-link');
        }
        // Open the menu.
        open() {
            this.toggle('open');
        }
        // Close the menu.
        close() {
            this.toggle('close');
        }
        toggle(action) {
            if ( this.isAnimating ) return;
            // (dis)allow the main image tilt effect.
            allowTilt = action === 'open' ? false : true;
            this.isAnimating = true;
            // Toggling the open state class.
            this.DOM.el.classList[action === 'open' ? 'add' : 'remove']('menu--open');
            // After all is animated..
            const animationEnd = (pos) => {
                if ( pos === this.itemsTotal-1 ) {
                    this.isAnimating = false;
                }
            };
            // Going through each menu´s item.
            this.DOM.items.forEach((el, pos) => {
                // The inner wrapper.
                const innerEl = el.querySelector('.menu__item-inner');
                // config and inner config will have the starting transform values (when opening) and the end ones (when closing) for both the item and its inner element.
                const config = {};
                const configInner = {};
                // Direction defined in the HTML data-direction.
                // bt (bottom to top) || tb (top to bottom) || lr (left to right) || rl (right to left)
                const direction = el.dataset.direction;
                // Using 101% instead of 100% to avoid rendering problems.
                // In order to create the "reveal" effect, the item slides moves in one direction and its inner element in the opposite direction.
                if ( direction === 'bt' ) {
                    config.y = '101%';
                    configInner.y = '-101%';
                    configInner.x = '0%';
                }
                else if ( direction === 'tb' ) {
                    config.y = '-101%';
                    configInner.y = '101%';
                    configInner.x = '0%';
                }
                else if ( direction === 'lr' ) {
                    config.x = '-101%';
                    configInner.x = '101%';
                }
                else if ( direction === 'rl' ) {
                    config.x = '101%';
                    configInner.x = '-101%';
                }
                else {
                    config.x = '101%';
                    config.y = '101%';
                    configInner.x = '-101%';
                    configInner.y = '-101%';
                }

                if ( action === 'open' ) {
                    // Setting the initial values.
                    TweenMax.set(el, config);
                    TweenMax.set(innerEl, configInner);

                    // Animate.
                    TweenMax.to([el,innerEl], .9, {
                        ease: Quint.easeOut,
                        x: '0%',
                        y: '0%',
                        onComplete: () => animationEnd(pos)
                    });
                }
                else {
                    TweenMax.to(el, 0.6, {
                        ease: Quart.easeInOut,
                        x: config.x || 0,
                        y: config.y || 0
                    });
                    TweenMax.to(innerEl, 0.6, {
                        ease: Quart.easeInOut,
                        x: configInner.x || 0,
                        y: configInner.y || 0,
                        onComplete: () => animationEnd(pos)
                    });
                }
            });

            // Show/Hide open and close ctrls.
            TweenMax.to(this.DOM.closeCtrl, 0.6, {
                ease: action === 'open' ? Quint.easeOut : Quart.easeInOut,
                startAt: action === 'open' ? {rotation: 0} : null,
                opacity: action === 'open' ? 1 : 0,
                rotation: action === 'open' ? 180 : 270
            });
            TweenMax.to(this.DOM.openCtrl, action === 'open' ? 0.6 : 0.3, {
                delay: action === 'open' ? 0 : 0.3,
                ease: action === 'open' ? Quint.easeOut : Quad.easeOut,
                opacity: action === 'open' ? 0 : 1
            });

            // Main links animation.
            TweenMax.staggerTo(this.DOM.mainLinks, action === 'open' ? 0.9 : 0.2, {
                ease: action === 'open' ? Quint.easeOut : Quart.easeInOut,
                startAt: action === 'open' ? {y: '50%', opacity: 0} : null,
                y: action === 'open' ? '0%' : '50%',
                opacity: action === 'open' ? 1 : 0
            }, action === 'open' ? 0.1 : -0.1);

            // Sidemenu links animation.
            TweenMax.staggerTo(this.DOM.sidemenuLinks, action === 'open' ? 0.5 : 0.2, {
                ease: action === 'open' ? Quint.easeInOut : Quart.easeInOut,
                startAt: action === 'open' ? {y: '100%'} : null,
                y: action === 'open' ? '0%' : '100%'
            }, action === 'open' ? 0.05 : -0.05);

            // The "Learn how to participate" menu link.
            TweenMax.to(this.DOM.menulink, action === 'open' ? 0.9 : 0.6, {
                ease: action === 'open' ? Quint.easeOut : Quart.easeInOut,
                startAt: action === 'open' ? {x: '10%'} : null,
                x: action === 'open' ? '0%' : '10%'
            });
        }
    }
	// Initialize the Menu.
    const menu = new Menu(document.querySelector('nav.menu'));

    // Preload images.
    imagesLoaded(document.querySelector('.background'), {background: true}, () => document.body.classList.remove('loading'));

    // extra stuff..

    // From http://www.quirksmode.org/js/events_properties.html#position
    // Get the mouse position.
	const getMousePos = (e) => {
        let posx = 0;
        let posy = 0;
		if (!e) e = window.event;
		if (e.pageX || e.pageY) 	{
			posx = e.pageX;
			posy = e.pageY;
		}
		else if (e.clientX || e.clientY) 	{
			posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
			posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
		}
		return { x : posx, y : posy }
    };

    // Main image  tilt effect.
    class TiltFx {
        constructor() {
            this.DOM = {main: document.querySelector('.background')};
            // Number of layers (how many repeated image elements)
            this.layersTotal = 4;
            this.layout();
            this.initEvents();
        }
        layout() {
            let inner = '';
            for (let i = 0; i <= this.layersTotal-1; ++i) {
                inner +=  '<div class="background__copy" style="background-image: url(img/is-bg.jpg)"></div>';
            }
            this.DOM.main.innerHTML = inner;
            this.DOM.layers = Array.from(this.DOM.main.querySelectorAll('.background__copy'));
        }
        initEvents() {
            this.mousemoveFn = ev => requestAnimationFrame(() => this.tilt(ev));
            document.body.addEventListener('mousemove', this.mousemoveFn);
        }
        // Tilt the image wrap and texts when mouse moving the current slide.
        tilt(ev) {
            if ( !allowTilt ) return;
            const mousepos = getMousePos(ev);
            const bounds = this.DOM.main.getBoundingClientRect();
            // Mouse position relative to the main element (this.DOM.main).
            const relmousepos = {
                x : mousepos.x - bounds.left,
                y : mousepos.y - bounds.top
            };

            this.DOM.layers.forEach((layer, pos) => {
                // Move the element from -val to val pixels in both x and y axis.
                let val = (pos+1);
                let t = {x:[val,-val],y:[val,-val]},
                    r = {x:[-2,2],y:[-val,val]},
                    s = {v:[1.03,0.97]};

                const transforms = {
                    translation : {
                        x: (t.x[1]-t.x[0])/bounds.width*relmousepos.x + t.x[0],
                        y: (t.y[1]-t.y[0])/bounds.height*relmousepos.y + t.y[0]
                    },
                    rotation : {
                        x: (r.x[1]-r.x[0])/bounds.height*relmousepos.y + r.x[0],
                        y: (r.y[1]-r.y[0])/bounds.width*relmousepos.x + r.y[0]
                    },
                    scale : {
                        v: (s.v[1]-s.v[0])/bounds.height*relmousepos.y + s.v[0],
                    }
                };

                TweenMax.to(layer, 1.5, {
                    ease: 'Power1.easeOut',
                    x: transforms.translation.x,
                    y: transforms.translation.y,
                    rotationX: transforms.rotation.x,
                    rotationY: transforms.rotation.y,
                    scale: transforms.scale.v,
                });
            });
        }
        // Scale up all the layers.
        zoom() {
            TweenMax.staggerTo( this.DOM.layers, 1.5, {
                ease: 'Expo.easeOut',
                x: 0,
                y: 0,
                rotationX: 0,
                rotationY: 0,
                scale: 1.1,
            }, 0.04);
        }
        reset() {
            TweenMax.staggerTo( this.DOM.layers, 1.5, {
                ease: 'Expo.easeOut',
                x: 0,
                y: 0,
                rotationX: 0,
                rotationY: 0,
                scale: 1,
            }, 0.07);
        }
    }

    let allowTilt = true;
    const tilt = new TiltFx();

    // Hovering the github link zooms in the main image.
    const githubEl =  document.querySelector('.github');
    githubEl.addEventListener('mouseenter', () => {
        allowTilt = false;
        tilt.zoom()
    });
    githubEl.addEventListener('mouseleave', () => allowTilt = true);
}

              
            
!
999px

Console