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Adding Classes

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About the <head>

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CSS

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About CSS Base

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HTML 

              
                <nav class="menu slide-menu-left">
    <ul>
      <li><button class="close-menu">← Close</button></li>
      <li><a href="#">Broccoli</a></li>
      ...
    </ul>
  </nav><!-- /slide menu left -->
 
  <nav class="menu slide-menu-right">
    <ul>
      <li><button class="close-menu">Close →</button></li>
      <li><a href="#">Broccoli</a></li>
      ...
    </ul>
  </nav><!-- /slide menu right -->
 
  <nav class="menu slide-menu-top">
    <ul>
      <li><button class="close-menu">↑ Close</button></li>
      <li><a href="#">Broccoli</a></li>
      ...
    </ul>
  </nav><!-- /slide menu top -->
 
  <nav class="menu slide-menu-bottom">
    <ul>
      <li><button class="close-menu">Close ↓</button></li>
      <li><a href="#">Broccoli</a></li>
      ...
    </ul>
  </nav><!-- /slide menu bottom -->
 
  <nav class="menu push-menu-left">
    <ul>
      <li><button class="close-menu">← Close</button></li>
      <li><a href="#">Broccoli</a></li>
      ...
    </ul>
  </nav><!-- /push menu left -->
 
  <nav class="menu push-menu-right">
    <ul>
      <li><button class="close-menu">Close →</button></li>
      <li><a href="#">Broccoli</a></li>
      ...
    </ul>
  </nav><!-- /push menu right -->
 
  <nav class="menu push-menu-top">
    <ul>
      <li><button class="close-menu">↑ Close</button></li>
      <li><a href="#">Broccoli</a></li>
      ...
    </ul>
  </nav><!-- /push menu top -->
 
  <nav class="menu push-menu-bottom">
    <ul>
      <li><button class="close-menu">Close ↓</button></li>
      <li><a href="#">Broccoli</a></li>
      ...
    </ul>
  </nav><!-- /push menu bottom -->
 
  <div id="wrapper">
    <div id="main">
      <div class="container">
        <div class="buttons">
          <button class="nav-toggler toggle-slide-left">Slide Menu Left</button>
          <button class="nav-toggler toggle-slide-right">Slide Menu Right</button>
          <button class="nav-toggler toggle-slide-top">Slide Menu Top</button>
          <button class="nav-toggler toggle-slide-bottom">Slide Menu Bottom</button>
          <button class="nav-toggler toggle-push-left">Push Menu Left</button>
          <button class="nav-toggler toggle-push-right">Push Menu Right</button>
          <button class="nav-toggler toggle-push-top">Push Menu Top</button>
          <button class="nav-toggler toggle-push-bottom">Push Menu Bottom</button>
        </div><!-- /buttons -->
        <section class="content">
          <h1>Vegetables</h1>
          <p>Turnip greens yarrow...</p>
        </section><!-- /.content -->
      </div>
    </div><!-- #main -->
 
  </div><!-- /#wrapper -->
!

CSS 

              
                body {
  overflow-x: hidden;
}
#wrapper {
  position: relative;
  z-index: 10;
  top: 0;
  left: 0;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -ms-transition: all 0.3s;
  -o-transition: all 0.3s;
  transition: all 0.3s;
}
section {
  margin-bottom: 30px;
}
section h1 {
  font-family: "Oswald", sans-serif;
  margin-bottom: 10px;
}
section p {
  margin-bottom: 30px;
}
section p:last-child {
  margin-bottom: 0;
}
section:last-child {
  margin-bottom: 0;
}
section.toggle {
  text-align: center;
}
.mask {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 15;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
}
/* Menus */
/* general style for all menus */
nav.menu {
  position: fixed;
  z-index: 20;
  background-color: #67b5d1;
  overflow: hidden;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -ms-transition: all 0.3s;
  -o-transition: all 0.3s;
  transition: all 0.3s;
}
nav.menu ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}
nav.menu a {
  font-weight: 300;
  color: #fff;
}
button.close-menu {
  background-color: #3184a1;
  color: #fff;
}
button.close-menu:focus {
  outline: none;
}

nav.slide-menu-left {
  top: 0;
  width: 300px;
  height: 100%;
}
nav.slide-menu-left li {
  display: block;
  text-align: center;
  border-bottom: solid 1px #3184a1;
  border-top: solid 1px #b5dbe9;
}
nav.slide-menu-left li:first-child {
  border-top: none;
}
nav.slide-menu-left li:last-child {
  border-bottom: none;
}
nav.slide-menu-left a {
  display: block;
  padding: 10px;
  font-size: 18px;
}
nav.slide-menu-left button.close-menu {
  margin: 10px 0;
  padding: 10px 30px;
  background-color: #3184a1;
  color: #fff;
}
nav.slide-menu-left {
  left: -300px;
}
body.sml-open nav.slide-menu-left {
  left: 0;
}

nav.slide-menu-right {
  top: 0;
  width: 300px;
  height: 100%;
}
nav.slide-menu-right li {
  display: block;
  text-align: center;
  border-bottom: solid 1px #3184a1;
  border-top: solid 1px #b5dbe9;
}
nav.slide-menu-right li:first-child {
  border-top: none;
}
nav.slide-menu-right li:last-child {
  border-bottom: none;
}
nav.slide-menu-right a {
  display: block;
  padding: 10px;
  font-size: 18px;
}
nav.slide-menu-right button.close-menu {
  margin: 10px 0;
  padding: 10px 30px;
  background-color: #3184a1;
  color: #fff;
}
nav.slide-menu-right {
  right: -300px;
}
body.smr-open nav.slide-menu-right {
  right: 0;
}

/**/
nav.slide-menu-top {
  left: 0;
  width: 100%;
  height: 100px;
}
nav.slide-menu-top ul {
  text-align: center;
  padding: 25px 0 0 0;
}
nav.slide-menu-top li {
  display: inline-block;
  margin: 0;
  vertical-align: middle;
}
nav.slide-menu-top a {
  display: block;
  line-height: 50px;
  padding: 0 10px;
  font-size: 18px;
}
nav.slide-menu-top button.close-menu {
  display: block;
  line-height: 50px;
  margin: 0;
  padding: 0 10px;
}
nav.slide-menu-top {
  top: -100px;
}
body.smt-open nav.slide-menu-top {
  top: 0;
}

/**/
nav.slide-menu-bottom {
  left: 0;
  width: 100%;
  height: 100px;
}
nav.slide-menu-bottom ul {
  text-align: center;
  padding: 25px 0 0 0;
}
nav.slide-menu-bottom li {
  display: inline-block;
  margin: 0;
  vertical-align: middle;
}
nav.slide-menu-bottom a {
  display: block;
  line-height: 50px;
  padding: 0 10px;
  font-size: 18px;
}
nav.slide-menu-bottom button.close-menu {
  display: block;
  line-height: 50px;
  margin: 0;
  padding: 0 10px;
}
nav.slide-menu-bottom {
  bottom: -100px;
}
body.smb-open nav.slide-menu-bottom {
  bottom: 0;
}

/**/
nav.push-menu-left {
  top: 0;
  width: 300px;
  height: 100%;
}
nav.push-menu-left li {
  display: block;
  text-align: center;
  border-bottom: solid 1px #3184a1;
  border-top: solid 1px #b5dbe9;
}
nav.push-menu-left li:first-child {
  border-top: none;
}
nav.push-menu-left li:last-child {
  border-bottom: none;
}
nav.push-menu-left a {
  display: block;
  padding: 10px;
  font-size: 18px;
}
nav.push-menu-left button.close-menu {
  margin: 10px 0;
  padding: 10px 30px;
  background-color: #3184a1;
  color: #fff;
}
nav.push-menu-left {
  left: -300px;
}
body.pml-open nav.push-menu-left {
  left: 0;
}
body.pml-open #wrapper {
  left: 300px;
}

/**/
nav.push-menu-right {
  top: 0;
  width: 300px;
  height: 100%;
}
nav.push-menu-right li {
  display: block;
  text-align: center;
  border-bottom: solid 1px #3184a1;
  border-top: solid 1px #b5dbe9;
}
nav.push-menu-right li:first-child {
  border-top: none;
}
nav.push-menu-right li:last-child {
  border-bottom: none;
}
nav.push-menu-right a {
  display: block;
  padding: 10px;
  font-size: 18px;
}
nav.push-menu-right button.close-menu {
  margin: 10px 0;
  padding: 10px 30px;
  background-color: #3184a1;
  color: #fff;
}
nav.push-menu-right {
  right: -300px;
}
body.pmr-open nav.push-menu-right {
  right: 0;
}
body.pmr-open #wrapper {
  left: -300px;
}

/**/
nav.push-menu-top {
  left: 0;
  width: 100%;
  height: 100px;
}
nav.push-menu-top ul {
  text-align: center;
  padding: 25px 0 0 0;
}
nav.push-menu-top li {
  display: inline-block;
  margin: 0;
  vertical-align: middle;
}
nav.push-menu-top a {
  display: block;
  line-height: 50px;
  padding: 0 10px;
  font-size: 18px;
}
nav.push-menu-top button.close-menu {
  display: block;
  line-height: 50px;
  margin: 0;
  padding: 0 10px;
}
nav.push-menu-top {
  top: -100px;
}
body.pmt-open nav.push-menu-top {
  top: 0;
}
body.pmt-open #wrapper {
  top: 100px;
}

/**/
nav.push-menu-bottom {
  left: 0;
  width: 100%;
  height: 100px;
}
nav.push-menu-bottom ul {
  text-align: center;
  padding: 25px 0 0 0;
}
nav.push-menu-bottom li {
  display: inline-block;
  margin: 0;
  vertical-align: middle;
}
nav.push-menu-bottom a {
  display: block;
  line-height: 50px;
  padding: 0 10px;
  font-size: 18px;
}
nav.push-menu-bottom button.close-menu {
  display: block;
  line-height: 50px;
  margin: 0;
  padding: 0 10px;
}
nav.push-menu-bottom {
  bottom: -100px;
}
body.pmb-open nav.push-menu-bottom {
  bottom: 0;
}
body.pmb-open #wrapper {
  top: -100px;
}
!

JS 

              
                // classie js
!function(s){"use strict";function n(s){return new RegExp("(^|\\s+)"+s+"(\\s+|$)")}var a,e,c;"classList"in document.documentElement?(a=function(s,n){return s.classList.contains(n)},e=function(s,n){s.classList.add(n)},c=function(s,n){s.classList.remove(n)}):(a=function(s,a){return n(a).test(s.className)},e=function(s,n){a(s,n)||(s.className=s.className+" "+n)},c=function(s,a){s.className=s.className.replace(n(a)," ")}),s.classie={hasClass:a,addClass:e,removeClass:c,has:a,add:e,remove:c}}(window);
// end of classie js

(function( window ){
 
  'use strict';
 
  var body = document.body,
    mask = document.createElement("div"),
    toggleSlideLeft = document.querySelector( ".toggle-slide-left" ),
    toggleSlideRight = document.querySelector( ".toggle-slide-right" ),
    toggleSlideTop = document.querySelector( ".toggle-slide-top" ),
    toggleSlideBottom = document.querySelector( ".toggle-slide-bottom" ),
    togglePushLeft = document.querySelector( ".toggle-push-left" ),
    togglePushRight = document.querySelector( ".toggle-push-right" ),
    togglePushTop = document.querySelector( ".toggle-push-top" ),
    togglePushBottom = document.querySelector( ".toggle-push-bottom" ),
    slideMenuLeft = document.querySelector( ".slide-menu-left" ),
    slideMenuRight = document.querySelector( ".slide-menu-right" ),
    slideMenuTop = document.querySelector( ".slide-menu-top" ),
    slideMenuBottom = document.querySelector( ".slide-menu-bottom" ),
    pushMenuLeft = document.querySelector( ".push-menu-left" ),
    pushMenuRight = document.querySelector( ".push-menu-right" ),
    pushMenuTop = document.querySelector( ".push-menu-top" ),
    pushMenuBottom = document.querySelector( ".push-menu-bottom" ),
    activeNav
  ;
  mask.className = "mask";
 
  /* slide menu left */
  toggleSlideLeft.addEventListener( "click", function(){
    classie.add( body, "sml-open" );
    document.body.appendChild(mask);
    activeNav = "sml-open";
  } );
 
  /* slide menu right */
  toggleSlideRight.addEventListener( "click", function(){
    classie.add( body, "smr-open" );
    document.body.appendChild(mask);
    activeNav = "smr-open";
  } );
 
  /* slide menu top */
  toggleSlideTop.addEventListener( "click", function(){
    classie.add( body, "smt-open" );
    document.body.appendChild(mask);
    activeNav = "smt-open";
  } );
 
  /* slide menu bottom */
  toggleSlideBottom.addEventListener( "click", function(){
    classie.add( body, "smb-open" );
    document.body.appendChild(mask);
    activeNav = "smb-open";
  } );
 
  /* push menu left */
  togglePushLeft.addEventListener( "click", function(){
    classie.add( body, "pml-open" );
    document.body.appendChild(mask);
    activeNav = "pml-open";
  } );
 
  /* push menu right */
  togglePushRight.addEventListener( "click", function(){
    classie.add( body, "pmr-open" );
    document.body.appendChild(mask);
    activeNav = "pmr-open";
  } );
 
  /* push menu top */
  togglePushTop.addEventListener( "click", function(){
    classie.add( body, "pmt-open" );
    document.body.appendChild(mask);
    activeNav = "pmt-open";
  } );
 
  /* push menu bottom */
  togglePushBottom.addEventListener( "click", function(){
    classie.add( body, "pmb-open" );
    document.body.appendChild(mask);
    activeNav = "pmb-open";
  } );
 
  /* hide active menu if mask is clicked */
  mask.addEventListener( "click", function(){
    classie.remove( body, activeNav );
    activeNav = "";
    document.body.removeChild(mask);
  } );
 
  /* hide active menu if close menu button is clicked */
  [].slice.call(document.querySelectorAll(".close-menu")).forEach(function(el,i){
    el.addEventListener( "click", function(){
      classie.remove( body, activeNav );
      activeNav = "";
      document.body.removeChild(mask);
    } );
  });
 
})( window );
!
999px

Console