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About the <head>

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CSS

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CSS Base

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HTML 

              
                <header class="header">
  <nav class="menu">
    <a href="#layer1" class="menu__item">1</a>
    <a href="#layer2" class="menu__item">2</a>
    <a href="#layer3" class="menu__item">3</a>
    <a href="#layer4" class="menu__item">4</a>
    <a href="#layer5" class="menu__item">5</a>
    <a href="#layer6" class="menu__item">6</a>
  </nav>
</header>

<footer class="footer">
  <p>&copy; 2014 OhDeer Games. All rights reserved.</p>
  <p>Pure JS version available @ <a href="https://github.com/iamryanyu/vanilla-farsight">github.com/iamryanyu/vanilla-farsight</a></p>
</footer>

<div class="wrapper">
  <div class="environment">
    <div class="scene">

      <div id="layer1" class="layer" data-depth="0">
        <h1>Layer 1</h1>
      </div>

      <div id="layer2" class="layer" data-depth="500">
        <h1>Layer 2</h1>
      </div>

      <div id="layer3" class="layer" data-depth="1000">
        <h1>Layer 3</h1>
      </div>

      <div id="layer4" class="layer" data-depth="1500">
        <h1>Layer 4</h1>
      </div>

      <div id="layer5" class="layer" data-depth="2000">
        <h1>Layer 5</h1>
      </div>

      <div id="layer6" class="layer" data-depth="2500">
        <h1>Layer 6</h1>
      </div>

    </div>
  </div>
</div>

<div class="scene__depth"></div>
!

CSS 

              
                .greyscale {
  filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
  /* Firefox 10+, Firefox on Android */

  filter: gray;
  /* IE6-9 */

  -webkit-filter: grayscale(100%);
  /* Chrome 19+, Safari 6+, Safari 6+ iOS */

}
.color {
  filter: none;
  -webkit-filter: grayscale(0%);
}
.cf {
  zoom: 1;
}
.cf:before,
.cf:after {
  content: "";
  display: table;
}
.cf:after {
  clear: both;
}
.flexbox {
  display: -ms-flexbox;
  /* TWEENER - IE 10 */

  display: -webkit-flex;
  /* NEW - Chrome */

  display: flex;
  /* NEW, Spec - Opera 12.1, Firefox 20+ */

}
.ib {
  display: -moz-inline-stack;
  display: inline-block;
  zoom: 1;
  *display: inline;
}
/* http://meyerweb.com/eric/tools/css/reset/
   v2.0 | 20110126
   License: none (public domain)
*/
html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
  display: block;
}
body {
  line-height: 1;
}
ol,
ul {
  list-style: none;
}
blockquote,
q {
  quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
  content: '';
  content: none;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}
* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -o-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}
html,
body {
  height: 100%;
}
body {
  font-family: 'open sans', sans-serif;
  font-size: 13px;
  line-height: 1.3;
  color: #fff;
  -webkit-font-smoothing: antialiased;
}
.heading,
p,
ul {
  margin: 0 0 10px;
}
.heading {
  font-weight: normal;
}
h1,
.h1 {
  margin: 0 0 10px;
  font-weight: normal;
  font-size: 2em;
}
h2,
.h2 {
  margin: 0 0 10px;
  font-weight: normal;
  font-size: 1.3em;
}
h3,
.h3 {
  margin: 0 0 10px;
  font-weight: normal;
  font-size: 1.2em;
}
h4,
.h4 {
  margin: 0 0 10px;
  font-weight: normal;
  font-size: 1em;
}
h5,
.h5 {
  margin: 0 0 10px;
  font-weight: normal;
  font-size: 0.9em;
}
strong {
  font-weight: bold;
}
small {
  font-size: 0.85em;
}
a {
  color: #fff;
  text-decoration: none;
}
hr {
  clear: both;
  height: 1px;
  border: none;
  border-top: 1px solid #ccc;
  margin: 0 0 10px;
}
body {
  background: #000;
}
.wrapper,
.environment,
.scene,
.layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.wrapper {
  position: fixed;
  z-index: 10;
}
.environment {
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-transform: perspective(500px);
  -moz-transform: perspective(500px);
  -o-transform: perspective(500px);
  transform: perspective(500px);
  -webkit-perspective: 500px;
  -moz-perspective: 500px;
  -ms-perspective: 500px;
  -o-perspective: 500px;
  perspective: 500px;
  -webkit-perspective-origin: center center;
  -moz-perspective-origin: center center;
  -ms-perspective-origin: center center;
  -o-perspective-origin: center center;
  perspective-origin: center center;
}
.scene {
  top: 0;
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
  -ms-transform-style: preserve-3d;
  -o-transform-style: preserve-3d;
  transform-style: preserve-3d;
}
.scene__depth {
  position: relative;
  z-index: 0;
}
.layer h1 {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300px;
  height: 300px;
  margin: -150px 0 0 -150px;
  font-size: 10px;
  color: #fff;
  padding: 5px;
}
#layer1 h1 {
  -webkit-box-shadow: 0 0 0 600px #4cc1e3;
  -moz-box-shadow: 0 0 0 600px #4cc1e3;
  -o-box-shadow: 0 0 0 600px #4cc1e3;
  box-shadow: 0 0 0 600px #4cc1e3;
}
#layer2 h1 {
  -webkit-box-shadow: 0 0 0 600px #4ba0bf;
  -moz-box-shadow: 0 0 0 600px #4ba0bf;
  -o-box-shadow: 0 0 0 600px #4ba0bf;
  box-shadow: 0 0 0 600px #4ba0bf;
}
#layer3 h1 {
  -webkit-box-shadow: 0 0 0 600px #497f9a;
  -moz-box-shadow: 0 0 0 600px #497f9a;
  -o-box-shadow: 0 0 0 600px #497f9a;
  box-shadow: 0 0 0 600px #497f9a;
}
#layer4 h1 {
  -webkit-box-shadow: 0 0 0 600px #465d76;
  -moz-box-shadow: 0 0 0 600px #465d76;
  -o-box-shadow: 0 0 0 600px #465d76;
  box-shadow: 0 0 0 600px #465d76;
}
#layer5 h1 {
  -webkit-box-shadow: 0 0 0 600px #46455b;
  -moz-box-shadow: 0 0 0 600px #46455b;
  -o-box-shadow: 0 0 0 600px #46455b;
  box-shadow: 0 0 0 600px #46455b;
}
#layer6 h1 {
  -webkit-box-shadow: 0 0 0 600px #442b3f;
  -moz-box-shadow: 0 0 0 600px #442b3f;
  -o-box-shadow: 0 0 0 600px #442b3f;
  box-shadow: 0 0 0 600px #442b3f;
}
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  text-align: center;
}
.menu {
  display: inline-block;
  margin: 0 auto;
}
.menu__item {
  display: block;
  float: left;
  text-decoration: none;
  padding: 10px;
}
.menu__item:hover,
.menu__item.menu__item--active {
  color: #F704C7;
}
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  text-align: center;
  padding: 10px;
  color: rgba(180, 180, 180, 0.7);
  font-size: 12px;
}
!

JS 

              
                const farsight = (() => {
  const selectors = {
    anchor: 'a[href^="#"]',
    depth: '.scene__depth',
    layers: '.layer',
    menu: '.menu',
    scene: '.scene',
  };

  const classes = {
    activeMenu: 'menu__item--active',
  };

  const distance = 500;

  /**
   * DO NOT EDIT BELOW. THE SKY WILL FALL.
   */
  const layers = [...document.querySelectorAll(selectors.layers)];

  const current = {
    layer: 0,
    progress: 0,
    menu: ''
  };

  let windowDepth = '';

  const setActive = () => {
    // update menu
    let position = current.layer + Math.round(current.progress);

    if (position !== current.menu) {
      const menuContainer = document.querySelector(selectors.menu);
      let menuActive = menuContainer.querySelector(`.${classes.activeMenu}`);
      let layer = document.querySelector(`.layer[data-depth="${position * distance}"]`);

      if (typeof menuActive !== 'undefined' && menuActive !== null) {
        menuActive.classList.remove(classes.activeMenu);
      }

      menuContainer.querySelector(`a[href="#${layer.getAttribute('id')}"]`).classList.add(classes.activeMenu);

      current.menu = position;
    }
  };

  const zoomScene = () => {
    let scroll = this.scrollY;

    // get scroll, cap within bounds
    scroll = scroll >= 0 ? (scroll <= windowDepth ? scroll : windowDepth) : 0;

    // set currents
    current.layer = (scroll / distance) | 0;
    current.progress = (scroll - (current.layer * distance)) / distance;
    current.overallProgress = (scroll / (distance * layers));

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

    // adjust scene
    setZPosition(scene, scroll);

    // update menu and layer
    setActive();
  };

  const setZPosition = (element, z) => {
    element.style.transform = `translate3d(0, 0, ${z}px)`;
  };

  const setDepth = () => {
    const depth = document.querySelector(selectors.depth);

    windowDepth = (distance * (layers.length - 1)) + document.body.clientHeight;
    depth.style.height = `${windowDepth}px`;
  };

  const scrollToLayer = (target) => {
    console.log(target);
    TweenLite.to(window, 1, {
      scrollTo: target,
    });
  };

  return {
    render: function() {
      // set environment depth
      setDepth();

      // set layer z position
      layers.map(layer => {
        const layerDepth = layer.getAttribute('data-depth');

        setZPosition(layer, layerDepth * -1);
      });

      // set initial position
      zoomScene();

      // zooming
      var throttledZoom = _.throttle(zoomScene, 25);

      window.addEventListener('scroll', throttledZoom);

      // resize
      window.addEventListener('resize', setDepth);

      // anchors
      const anchors = [...document.querySelectorAll(selectors.anchor)];

      anchors.map(anchor => {
        anchor.addEventListener('click', function (e) {
          e.preventDefault();
          const targetAnchor = this.getAttribute('href');
          const target = document.querySelector(targetAnchor).getAttribute('data-depth');

          scrollToLayer(target);
        });
      });
    }
  }
})();

farsight.render();
!
999px

Console