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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="under-nav">
  <nav class="mobile-nav">
    <ul>
      <li>
        <a href="#">
          First Nav Item
        </a>
      </li>
      <li>
        <a href="#">
          Super Nav Item
        </a>
      </li>
      <li>
        <a href="#">
          Oh Snap! Nav Item
        </a>
      </li>
      <li>
        <a href="#">
          Last Nav Item
        </a>
      </li>
    </ul>
  </nav>
</div>

<div class="page-wrap">
  <div class="active-click"><!-- overlay for click back to mobile --></div>
  
  <div class="mobile-top-bar">
    <div class="toggleMenu" >
      <!-- icon font button -->
    </div>
  </div>
  
  <div class="main">
    <h2>iOS7 Zoom-out Side Nav Reveal</h2>
    <p>HTML/CSS/JS version of <a href="http://dribbble.com/shots/1114754-Social-Feed-iOS7">http://dribbble.com/shots/1114754-Social-Feed-iOS7</a>. </p>
      
     <p>Nullam quis risus eget urna mollis ornare vel eu leo. Integer posuere erat a ante venenatis dapibus posuere velit aliquet. Vestibulum id ligula porta felis euismod semper. Maecenas faucibus mollis interdum. Etiam porta sem malesuada magna mollis euismod. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>

<p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    
    <h3>There is a lot of "content" here.</h3>
    
    <p>I wanted to show how it "crops" the page to the window size for the zoom-out animation.</p>
    
    <p>Nullam quis risus eget urna mollis ornare vel eu leo. Integer posuere erat a ante venenatis dapibus posuere velit aliquet. Vestibulum id ligula porta felis euismod semper. Maecenas faucibus mollis interdum. Etiam porta sem malesuada magna mollis euismod. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>

<p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Curabitur blandit tempus porttitor. Cras mattis consectetur purus sit amet fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue. Curabitur blandit tempus porttitor.</p>

<p>Cras mattis consectetur purus sit amet fermentum. Curabitur blandit tempus porttitor. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>

    <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Vestibulum id ligula porta felis euismod semper. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
  </div>
</div>
!

CSS 

              
                @import "compass/css3";

// All the fontz
@import url(//fonts.googleapis.com/css?family=Arvo:300,400,700,400italic);

// Color Theory
$yellow: #e8c63d;
$darkyellow: #d4aa02;
$grey: #ddd;
$coal: #333;
$white: #fff;

// Global Things
*,
*:after,
*:before {
  @include box-sizing(border-box);
}
body {
  background-color: #4b335a; // Old browsers
  @include filter-gradient(#4b335a, #4b335a, vertical); // IE6-9
  @include background-image(linear-gradient(left top, #4b335a 0%,#bc8282 45%,#cfae8d 60%,#bc8282 75%,#4b335a 100%));
  color: $coal;
  font-family: "Lato", Sans-Serif;
  font-size: 100%;
  height: 100%;
  width: 100%;
}
a{
  color: $darkyellow;
  text-decoration: none;
  &:hover, &:focus{
    text-decoration: underline;
  }
}

// Container Things
.active-nav .page-wrap{
  position: relative;
  @include transition( transform 0.3s ease-out);
  @include transform( scale(.6) translateX(200px) );
  z-index: 1000;
  .active-click{
    cursor: pointer;
    display: block;
    height: 100%;
    position: absolute;
    width: 100%;
    z-index: 9999;
  }
}
.page-wrap{
  @include backface-visibility( hidden ); // stops flash from css transitions - only seen on iOS Chrome (so far)
  background: $white;
  @include box-shadow(#333 0px 0px 10px 0px);
  height: 100%;
  position: relative;
  @include transition( transform 0.3s ease-out );
  width: 100%;
  z-index: 200; // must be higher than "under-nav"
}
.active-click{
  display: none;
}
.crop{
  overflow: hidden; //cuts the page at window size
}
.main{
  padding: 20px 25%;
}

// So a mobile nav is in a bar...
.mobile-top-bar{
  background: $yellow;
  height: 42px;
  margin-top: 0px;
  padding: 8px;
  position: relative;
  z-index: 100;
}
.toggleMenu{
  background: $coal;
  color: $white;
  cursor: pointer;
  display: block;
  height: 28px;
  padding: 7px 8px;
  width: 28px;
}

// Mobile-Nav ------------
.mobile-nav{
  position: absolute;
  top: 75px;
  left: 30px;
  li{
    height: 75px; // Adjust this if you add more nav items and for landscape responsive
    list-style: none;
    width: 100%;
  }
  .active a{
    color: $coal;
  }
  a{
    color: $white;
    font-weight: 300;
    opacity: 0;
    padding-left: 200px;
    text-decoration: none;
    @include transition(all .2s ease-out);
    @include transition-delay(0s);
    &:hover, &:focus{
      color: $darkyellow;
      @include transition(all .5s ease-out);
    }
  }
}
.active-nav .mobile-nav li.show-nav a{
  opacity: 1;
  padding-left: 0px;
  @include transition(all .2s ease-out);
}
!

JS 

              
                (function($) {
  jQuery(document).ready(function() {

    // Mobile Menu - Open Sesame -------------
    $('.toggleMenu').click(function() {
     
      var windowHeight = $(window).height();
      
      $('.page-wrap').height(windowHeight); // sets height to cut page to visible window size
      $('body').addClass('active-nav');
      $('.page-wrap').addClass('crop'); // "proper" crop
      
      // Show me the links
      var timer = 0;
      $.each($('.mobile-nav li'), function (i, s) {
        timer = 40 * i;
        setTimeout(function () {
          $(s).addClass('show-nav');
        }, timer); // show menu items on timer
      });
      
    });

    // Mobile Menu - Lock It Up ----------------
    $('.active-click').click(function() {
      $('body').removeClass('active-nav');
      $('.mobile-nav li').removeClass('show-nav');
      
      		setTimeout(function(){
        $('.page-wrap').removeClass('crop'); // release the "proper" crop
        $('.page-wrap').height('auto'); // resets height for scolling
      }, 300);
    });
  });

}(jQuery));
!
999px

Console