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HTML

              
                <!--

Copyright © David Bushell | @dbushell | http://dbushell.com

-->

<div class="site">

  <button data-modal="nav" data-action="open" class="nav-open button button--circular" type="button"><span><i class="fa fa-bars"></i></span></button>

  
  <div class="site-content">
    
    <button data-modal="test" data-action="open" class="button button--circular" type="button"><span>Hello!</span></button>
    
  </div>

</div>
<!--/.site-->


<div class="overlay">
  <div class="overlay__ripple"></div>
</div>

<div class="modal-wrapper">
  
  <nav class="modal" data-modal="nav">
    <ul>
      <li><a href="http://dbushell.com/">Home</a></li>
      <li><a href="http://dbushell.com/about/">About</a></li>
      <li><a href="http://dbushell.com/showcase/">Portfolio</a></li>
      <li><a href="http://dbushell.com/responsive-design/">Services</a></li>
      <li><a href="http://dbushell.com/blog/">Blog</a></li>
      <li><a href="http://dbushell.com/contact/">Contact</a></li>
      <li><a href="https://twitter.com/dbushell"><i class="fa fa-twitter"></i> @dbushell</a></li>
    </ul>
    <a href="#main" class="button button--circular" data-action="close"><span><i class="fa fa-close"></i></span></a>
  </nav>
  
  <div class="modal" data-modal="test">
    <h1 style="font-size: 35px; line-height: 35px; margin: 0 0 14px 0;">I am David Bushell</h1>
    <p style="color:#919599; font-size: 17px; line-height: 21px; margin: 0 0 21px 0;"><a href="http://dbushell.com/">I freelance</a> for small businesses, start-ups, individuals, and fellow web agencies.</p>
    <div class="modal__footer">
      <button class="button" data-action="close" type="button">Awesome!</button>
    </div>
  </div>
  
</div>



              
            
!

CSS

              
                /*

Copyright © David Bushell | @dbushell | http://dbushell.com

*/

@function rem($px, $base: 16) {
    @return ($px / $base) + rem;
}

$color--white     : #fff;
$color--silver    : #f7f7f5;
$color--slate     : #494b4c;
$color--cream     : #f2f0e6;
$color--canvas    : #d9d7ce;
$color--highlight : #fff699;
$color--error     : #e54545;
$color--green     : #99cc66;
$color--blue      : #3d9ccc;
$color--dark-blue : #226181;

$color--grey       : #494b4d;
$color--dark-grey  : #303233;
$color--light-grey : #919599;

$color--line       : lighten(#b3b0aa, 15);
$color--light-line : lighten($color--line, 15);
$color--dark-line  : darken($color--line, 15);

html {
  height: 100%;
  color: $color--grey;
  font-family: 'Droid Serif', serif;
}

body {
  height: 100%;
  overflow-x: hidden;
  background: $color--cream;
  
  &.js-lock-scroll {
    overflow: hidden !important;
  }
  
  &.js-lock-pointer {
    pointer-events: none !important;
  }
}

a {
  color: $color--blue;
  text-decoration: none;
  
  &:focus, &:hover {
    color: $color--dark-blue;
  }
}

.site {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: visible;
  
/*  .js-lock-scroll & {
    overflow: hidden;
  }*/
}

.site-content {
  display: -ms-flexbox;
  -ms-flex-align: center;
  -ms-flex-pack: center;
  
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100%;
  padding-bottom: 100px;
}

.button {
  display: inline-block;
  appearance: none;
  outline: none;
  border: none;
  padding: 0;
  margin: 0;
  font-weight: bold;
  font-size: rem(14);
  line-height: rem(21);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  box-shadow: 1px 1px 2px rgba(0,0,0, 0.1);
  transition: color 150ms ease, box-shadow 150ms ease, background 300ms ease;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  background: #fff;
  color: $color--blue;
  
  &:hover {
    color: $color--dark-blue;
    box-shadow: 1px 2px 3px rgba(0,0,0, 0.2);
  }
  
  &:active {
    color: #fff;
    transition: none;
    background: $color--blue;
  }
}

.button:not([class*='button--']) {
  padding: rem(7) rem(14);
}

.button--circular {
  position: relative;
  border-radius: 100%;
  padding: rem(14);
  
  span {
    display: block;
    height: 0;
    line-height: 0;
    margin: 50% 0 -50% 0;
    width: calc(100%);
    padding-bottom: calc(100%);
  }
  
  .fa {
    display: inline;
    line-height: 0;
  }
}

.nav-open {
  position: absolute;
  position: fixed;
  top: rem(14);
  left: rem(14);
}

.overlay,
.modal-wrapper {
  position: fixed;
  display: none;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
}

.overlay {
  z-index: 10000;
  overflow: hidden;
  
  &.js-open {
    display: block;
  }
}

.overlay__ripple {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 100%;
  background: $color--blue;
  opacity: 0;
  transform-origin: 0 0;
  backface-visiblity: hidden;
  transform: scale(0) translate3d(-50%, -50%, 0);
  transition: opacity 600ms ease-in-out, transform 600ms cubic-bezier(0.7, 0, 0.6, 0.8);
  
  .overlay[data-modal="nav"] & {
    background: $color--green;
  }
  
  .js-animate-in & {
    opacity: 0.8;
    transform: scale(1) translate3d(-50%, -50%, 0);
  }
  
  .js-animate-done & {
    border-radius: 0;
    transform: none;
    transition: opacity 600ms ease-in-out;
  }
}

.modal-wrapper {
  z-index: 10001;
  overflow: hidden;
  -webkit-overflow-scrolling: touch;
  
  display: -ms-flexbox;
  -ms-flex-align: center;
  -ms-flex-pack: center;
  
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  
  .overlay:not(.js-open) + & {
    display: none;
  }
  
  .overlay.js-animate-in.js-animate-done + & {
    overflow: auto;
  }

  &:after, &:before {
    display: block;
    content: "";
  }
}

.modal {
  box-sizing: border-box;
  position: relative;
  display: none;
  max-width: 400px;
  margin: rem(28);
  padding: rem(21);
  padding-bottom: rem(63);
  background: #fff;
  box-shadow: 1px 2px 3px rgba(0,0,0, 0.1);
  opacity: 0;
  transform: translateZ(0);
  transition: opacity 300ms 150ms ease-in-out, transform 300ms 150ms ease-in-out;
}

// nav

.modal[data-modal="nav"] {
  transform: scale(0.5);
  transform-origin: 0 0;
  padding: rem(14) rem(28);
  width: 100%;
  max-width: rem(240);
  
  ul {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  
  li {
    display: block;
    border-bottom: 1px solid $color--line;
    
    &:last-child {
      border-bottom: 0;
    }
    
    a {
      display: block;
      font-size: rem(16);
      line-height: rem(28);
      padding: rem(7);
    }
  }
  
  .button[data-action="close"] {
    position: absolute;
    top: rem(-14);
    left: rem(-14);
  }
}

.overlay[data-modal="nav"] {
  
  & + .modal-wrapper {
    justify-content: flex-start;
    align-items: flex-start;
    flex-direction: row;
    
    &:after, &:before {
      display: none;
    }
  }
  
  // yeah the selectors and HTML configuration could be improved...
  
  &.js-open + .modal-wrapper .modal[data-modal="nav"] {
      display: block;
  }

  &.js-animate-in + .modal-wrapper .modal[data-modal="nav"] {
      opacity: 1;
      transform: scale(1);
  }
}

// test modal

.modal[data-modal="test"] {
  opacity: 0;
  transform: scale(0.95);
  
  .cssclippaths & {
    transform: translateZ(0);
    -webkit-clip-path: circle(0% at 50% 50%);
    transition: opacity 300ms ease-in-out, -webkit-clip-path 300ms cubic-bezier(0.7, 0, 0.6, 0.8);
  }

}

.overlay[data-modal="test"] {
  
  &.js-open + .modal-wrapper .modal[data-modal="test"] {
      display: block;
  }

  &.js-animate-in + .modal-wrapper .modal[data-modal="test"] {
      opacity: 1;
      transform: scale(1);
  }
}

.modal__footer {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: rem(14) rem(21);
  background: $color--canvas;
  text-align: right;
}
              
            
!

JS

              
                /*

Copyright © David Bushell | @dbushell | http://dbushell.com

*/

var $html = $(document.documentElement),
    $site = $('.site'),
		$body = $('body');

// animating clip-path is not playing nice in Safari
// http://browserhacks.com/

var hasCSSClipPaths = !!window.chrome && !/constructor/i.test(window.HTMLElement);

if (hasCSSClipPaths) {
  $html.addClass('cssclippaths');
}

$(window).scrollTop(0);

var $modal   = null,
		$overlay = $('.overlay'),
    $wrapper = $('.modal-wrapper'),
    $ripple  = $('.overlay__ripple');

function lockScroll(pointer)
{
//   var st = $(window).scrollTop();
  var w2, w1 = $html[0].clientWidth;
  $body.addClass('js-lock-scroll' + (pointer ? ' js-lock-pointer' : ''));
//   $site.css('margin-top', -st);  
  w2 = $html[0].clientWidth;
  // replace scrollbar with padding
  if (w2 > w1) {
	  $body.css('padding-right', w2 - w1);
  }
}

function unlockScroll()
{
//   var st = Math.abs(parseInt($site.css('margin-top'), 10));
//   $site.css('margin-top', 0);
  $body.css('padding-right', '').removeClass('js-lock-scroll js-lock-pointer');
//   $('html,body').scrollTop(st);
}

// return distance between two points
function dist(p1, p2)
{
  var xs = p2[0] - p1[0];
  var ys = p2[1] - p1[1];
  return Math.sqrt((xs * xs) + (ys * ys));
}

// return max width of a circle needed to cover a rectangle
function fillViewport(p1, width, height)
{
  // calc radius from centre to each corner
  var nw = dist(p1, [0,          0]),
      ne = dist(p1, [width,      0]),
      se = dist(p1, [width, height]),
      sw = dist(p1, [0,     height]);
  // return diameter required
  return 2 * Math.max(nw, ne, se, sw);
}

var openOverlay = function(btn, id)
{
  $modal = $('.modal[data-modal="' + id + '"]');

  lockScroll(true);
  
  requestAnimationFrame(function() {
  
    $overlay.addClass('js-open').attr('data-modal', id);
    var bounds = btn.getBoundingClientRect();

    // get viewport dimensions
    var vw = $(window).width(),
        vh = $(window).height();

    // get position of the button centre
    var p1 = [bounds.left + bounds.width / 2, bounds.top + bounds.height / 2];

    // calc max diameter required to fill viewport
    var diameter = fillViewport(p1, vw, vh);
    
    // pixels per second (animation speed)
    var pps = 3000;

    // scale minimum duration somewhat proportionally 
    var duration = 400 + (Math.round((diameter / pps) * 1000) * 0.5);

    $ripple.css({ 
      'transition-duration' : duration + 'ms',
      'width'  : diameter,
      'height' : diameter,
      'left'   : p1[0],
      'top'    : p1[1]
    });
    
    if (hasCSSClipPaths && id === 'test') {
      $modal.css('transition-duration', '300ms, ' + duration + 'ms');
      $modal.css('-webkit-clip-path', 'circle(' + (diameter/2) + 'px at 50% 50%)');
    }

    requestAnimationFrame(function() {
      $overlay.addClass('js-animate-in');

      $ripple.one('transitionend', function() {
        $overlay.addClass('js-animate-done');
        $body.removeClass('js-lock-pointer');
        $ripple.removeAttr('style');
      	
      })
    });
    
  });
};

var closeOverlay = function() {
  $body.addClass('js-lock-pointer');
  
  requestAnimationFrame(function() {
    $modal.removeAttr('style');
  	$overlay.removeClass('js-animate-in');
  });  

  $ripple.one('transitionend', function() {
    $wrapper.scrollTop(0);
  	$overlay.removeClass('js-open js-animate-done').removeAttr('data-modal');
    unlockScroll();
  });
}

$('[data-modal][data-action="open"]').on('click', function() {
  var btn = this;
  requestAnimationFrame(function() {
	  openOverlay(btn, $(btn).data('modal'));
  });
});

$overlay.on('click', function() {
  requestAnimationFrame(function() {
    closeOverlay();
  });
});

$wrapper.on('click', function(e) {
  var $target = $(e.target);
  if ($target.hasClass('modal')) return;
  if ($target.parents('.modal').length && $target.data('action') !== 'close') {
    if (!$target.parents('[data-action="close"]').length) {
    	return;
    }
  }
  e.preventDefault();
  requestAnimationFrame(function() {
    closeOverlay();
  });
});

// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
 
// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
 
// MIT license
 
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] 
                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
    }
 
    if (!window.requestAnimationFrame)
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() { callback(currTime + timeToCall); }, 
              timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };
 
    if (!window.cancelAnimationFrame)
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
}());
              
            
!
999px

Console