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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

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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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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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HTML 

              
                <div class="header animated fadeInLeft">
  <div class="container">
    <div class="site-brand">Navigation Example</div>
    <nav>
      <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Work</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </nav>
  </div>
</div>

<div class="header-sticky">
  <div class="container">
    <div class="site-brand">Navigation Example</div>
    <nav>
      <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Work</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </nav>
  </div>
</div>

<div class="opening"></div>
<div class="content">
  <div class="container">
    <h1>Scroll Down</h1>
    
    <p>Uses <a href="https://daneden.github.io/animate.css/">animate.css</a> for all my animations.</p>
    
    <p>I bet there is a better way to do this without using 2 headers. Let me know if you have a better solution!</p>
    
    <p>Pop-up salvia meh, direct trade vinyl normcore Intelligentsia seitan pickled. Normcore Shoreditch distillery, Neutra artisan health goth hashtag keffiyeh sartorial chia umami next level cold-pressed lo-fi. Pitchfork Carles heirloom biodiesel dreamcatcher semiotics, food truck sriracha Thundercats fingerstache 8-bit. Wayfarers Bushwick occupy four loko cardigan, skateboard crucifix Pinterest twee. Semiotics keytar selfies iPhone, tofu tousled umami Kickstarter Pitchfork Shoreditch polaroid 3 wolf moon Neutra Odd Future drinking vinegar. Heirloom yr squid Helvetica aesthetic. Pickled cred asymmetrical, twee listicle slow-carb Thundercats wolf Etsy post-ironic banh mi cold-pressed tousled pop-up.</p>

    <p>IPhone pug wayfarers Pinterest, sustainable readymade butcher pop-up actually mixtape bitters ethical. Fap cronut cardigan, bespoke heirloom Banksy flannel tousled. Fixie YOLO blog distillery, squid PBR put a bird on it Shoreditch pour-over 3 wolf moon heirloom ennui salvia paleo sustainable. Brunch fashion axe vegan, organic mumblecore skateboard selvage kitsch fixie DIY hella. Hella paleo Pinterest, XOXO put a bird on it chillwave Carles disrupt Kickstarter locavore American Apparel tilde twee pickled church-key. +1 ugh forage pop-up, artisan paleo skateboard. Hashtag before they sold out deep v, lo-fi gastropub crucifix salvia four loko Portland cronut Truffaut.</p>
    </div>
</div>
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CSS 

              
                body{
  font-family: 'Noto Sans', sans-serif;
  font-size: 20px;
  line-height: 1.45;
  margin: 0;
  padding: 0;
}

.container{
  width: 600px;
  margin: auto;
}

.header{
  position: fixed;
  width: 100%;
  top: 0;
  padding: 20px 0;
}

.header-sticky{
  background: tomato;
  position: fixed;
  width: 100%;
  padding: 10px 0;
  opacity: 0;
  
  .site-brand{
    float: left;
  }
  
  nav{
    float: right;
    li{
      float: left;
      display: inline-block;
      margin-left: 20px;
    }
  }
}

.site-brand{
  color: #fff;
}

.opening{
  background: DarkTurquoise ;
  height: 400px;
}

nav{
  
  ul{
    padding: 0;
    margin: 0;
  }
  
  li{
    display: block;
  }
  
  a{
    color: #fff;
    text-decoration: none;
  }
}

.hidden{
  display: none;
}
!

JS 

              
                
$(document).ready(function(){
  $(window).scroll(function(){
    var scrollTop = $(window).scrollTop();
    if (scrollTop > 249) {
        $('.header').addClass('fadeOutLeft');
        $('.header').removeClass('fadeInLeft');
        $('.header-sticky').addClass('fadeInDown');
        $('.header-sticky').removeClass('fadeOutUp');
        $('.header-sticky').addClass('animated');      
    } else {
        $('.header').addClass('fadeInLeft');
        $('.header').removeClass('fadeOutLeft');
        $('.header-sticky').addClass('fadeOutUp');
        $('.header-sticky').removeClass('fadeInUp');

    }
  });
});
!
999px

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