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CSS

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HTML 

              
                <div id="oc-container" class="oc-container">
  <div class="oc-pusher">

    <div id="oc-trigger">
      <button id="menu-button" data-effect="oc-push">Menu</button>
    </div>

    <header role="banner">
      <h1 class="company-name">A11Y Off Canvas Push Menu</h1>

      <nav id="menu" class="oc-menu oc-push" role="navigation">
        <ul>
          <li><a href="#">About</a></li>
          <li><a href="#">Shop</a></li>
          <li><a href="#">Gallery</a></li>
          <li><a href="#">FAQs</a></li>
          <li><a href="#">Support</a></li>
          <li><a href="#">login</a></li>
          <li><a href="#">Partners</a></li>
          <li><a href="#">Members</a></li>
          <li><a href="#">Site Map</a></li>
          <li><a href="#">News</a></li>
          <li><a href="#">RSS Feed</a></li>
          <li><a href="#">Facebook</a></li>
          <li><a href="#">Twitter</a></li>
          <li><a href="#">Flickr</a></li>
          <li><a href="#">Skype</a></li>
        </ul>
      </nav>
    </header>

    <main class="oc-content" role="main">
      <div class="oc-content-inner">
        <div class="main">

          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
          <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>

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

  </div>
</div>
!

CSS 

              
                .oc-container,
.oc-pusher,
.oc-content {
  height: 100%;
}

.oc-content {
  overflow-y: scroll;
}

.oc-content,
.oc-content-inner {
  position: relative;
}

.oc-container {
  position: relative;
  overflow: hidden;
  overflow-y: scroll;
}

.oc-pusher {
  height: auto;
  position: relative;
  left: 0;
  -webkit-transition: -webkit-transform 400ms;
  transition: transform 400ms;
  z-index: 99;
}
.oc-pusher::after {
  content: '';
  height: 0;
  position: absolute;
  top: 0;
  right: 0;
  opacity: 0;
  width: 0;
  -webkit-transition: opacity 400ms, width 0.1s 400ms, height 0.1s 400ms;
  transition: opacity 400ms, width 0.1s 400ms, height 0.1s 400ms;
  background: transparent;
}
.oc-menu-open .oc-pusher::after {
  height: 100%;
  opacity: 1;
  -webkit-transition: opacity 400ms;
  transition: opacity 400ms;
  width: 100%;
}

.oc-menu {
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  -webkit-transition: all 400ms;
  transition: all 400ms;
  visibility: hidden;
  width: 225px;
  z-index: 100;
  background: #999999;
}
.oc-menu-open .oc-menu::after {
  height: 0;
  opacity: 0;
  -webkit-transition: opacity 400ms, width 0.1s 400ms, height 0.1s 400ms;
  transition: opacity 400ms, width 0.1s 400ms, height 0.1s 400ms;
  width: 0;
}

.oc-push.oc-menu {
  -webkit-transform: translate3d(-100%, 0, 0);
  transform: translate3d(-100%, 0, 0);
}
.oc-push.oc-menu::after {
  display: none;
}
.oc-push.oc-menu-open .oc-pusher {
  -webkit-transform: translate3d(225px, 0, 0);
  transform: translate3d(225px, 0, 0);
}

.oc-push.oc-menu-open .oc-push.oc-menu {
  overflow: scroll;
  -webkit-transition: -webkit-transform 400ms;
  transition: transform 400ms;
  visibility: visible;
}

.no-js .oc-menu {
  height: auto;
  position: static;
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  width: 100%;
  visibility: visible;
}
.no-js #oc-trigger {
  display: none;
}
.no-js .oc-pusher {
  padding-left: 0;
}

.no-csstransforms3d .oc-pusher {
  padding-left: 225px;
}
!

JS 

              
                /*!
 * classie - class helper functions
 * from bonzo https://github.com/ded/bonzo
 * 
 * classie.has( elem, 'my-class' ) -> true/false
 * classie.add( elem, 'my-new-class' )
 * classie.remove( elem, 'my-unwanted-class' )
 * classie.toggle( elem, 'my-class' )
 */
(function(e){"use strict";function t(e){return new RegExp("(^|\\s+)"+e+"(\\s+|$)")}function s(e,t){var s=n(e,t)?i:r;s(e,t)}var n,r,i;if("classList"in document.documentElement){n=function(e,t){return e.classList.contains(t)};r=function(e,t){e.classList.add(t)};i=function(e,t){e.classList.remove(t)}}else{n=function(e,n){return t(n).test(e.className)};r=function(e,t){if(!n(e,t)){e.className=e.className+" "+t}};i=function(e,n){e.className=e.className.replace(t(n)," ")}}var o={hasClass:n,addClass:r,removeClass:i,toggleClass:s,has:n,add:r,remove:i,toggle:s};if(typeof define==="function"&&define.amd){define(o)}else{e.classie=o}})(window);


/**
 * sidebarEffects.js v1.0.0
 * http://www.codrops.com
 *
 * Licensed under the MIT license.
 * https://www.opensource.org/licenses/mit-license.php
 * 
 * Copyright 2013, Codrops
 * http://www.codrops.com
 */

/*
 * ARIA Modifications made for the @A11YProject
 * by @gryghostvisuals & @svinkle
 */
var SidebarMenuEffects = (function() {

  function hasParentClass( e, classname ) {
    if(e === document) return false;

    if( classie.has( e, classname ) ) {
      return true;
    }

    return e.parentNode && hasParentClass( e.parentNode, classname );
  }

  // http://coveroverflow.com/a/11381730/989439
  function mobilecheck() {
      var check = false;
      (function(a){if(/(android|ipad|playbook|silk|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0,4)))check = true})(navigator.userAgent||navigator.vendor||window.opera);
      return check;
  }

  function init() {

    // ARIA
    var trigger = document.getElementById('menu-button'),
        menu = document.getElementById('menu');

    trigger.setAttribute('aria-expanded', 'false');
    trigger.setAttribute('aria-label', 'Menu');
    trigger.setAttribute('aria-controls', 'menu');

    menu.setAttribute('aria-hidden', 'true');
    menu.setAttribute('aria-labelledby', 'menu-button');

    var container = document.getElementById( 'oc-container' ),
        buttons = Array.prototype.slice.call( document.querySelectorAll( '#oc-trigger > button' ) ),
        // event type (if mobile use touch events)
        eventtype = mobilecheck() ? 'touchstart' : 'click',
        resetMenu = function() {
          trigger.setAttribute('aria-expanded', 'false');
          menu.setAttribute('aria-hidden', 'true');
          classie.remove( container, 'oc-menu-open' );
        },
        bodyClickFn = function(evt) {
          if( !hasParentClass( evt.target, 'oc-menu' ) ) {
            resetMenu();
            document.removeEventListener( eventtype, bodyClickFn );
          }
        };

    buttons.forEach( function( el, i ) {
      var effect = el.getAttribute( 'data-effect' );

      el.addEventListener( eventtype, function( ev ) {
        ev.stopPropagation();
        ev.preventDefault();
        el.setAttribute('aria-expanded', 'true');
        menu.setAttribute('aria-hidden', 'false');
        container.className = 'oc-container'; // clear
        classie.add( container, effect );
        setTimeout( function() {
            classie.add( container, 'oc-menu-open' );
        }, 25 );
        document.addEventListener( eventtype, bodyClickFn );
      });

    });

    // Handle 'esc' event
    // Keyboard Tweaks via Scott Vinkle
    var escapeMenu = function (ev) {
      if (ev.which === 27) {
          ev.stopPropagation();
          ev.preventDefault();
          resetMenu();
          trigger.focus();
        }
    };

    trigger.addEventListener( 'keydown', function( ev ) {
        escapeMenu(ev);
    });

    menu.addEventListener( 'keydown', function( ev ) {
        escapeMenu(ev);
    });
  }

  init();

})();
!
999px

Console