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HTML

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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-.

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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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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

Add Packages

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 esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                <div class="header">
  <div class="header-fixed">
    <span>Logo Here</span>
  </div>
  <div class="header-notFixed">
    <p>Fixed Header (Quick Hack)</p>
  </div>
  
  <div class="content">
    <h2>Some hipster talk</h2>
    <p>
    Chia hashtag food truck, Pitchfork flexitarian chambray shabby chic fap. PBR mixtape Schlitz, hoodie banh mi swag occupy asymmetrical skateboard stumptown distillery hella drinking vinegar. Tonx polaroid tousled Truffaut, YOLO single-origin coffee hashtag you probably haven't heard of them blog scenester roof party chia selvage sustainable. Swag fashion axe selvage Helvetica roof party, seitan McSweeney's meggings tousled. Gentrify mlkshk chambray YOLO Austin keffiyeh. Chillwave try-hard sartorial squid. Viral Marfa church-key post-ironic, forage seitan messenger bag yr typewriter selvage letterpress paleo.
    </p>
    <p>
Sustainable wayfarers flannel drinking vinegar. Fingerstache retro locavore, slow-carb Echo Park bicycle rights four loko authentic PBR. Slow-carb Cosby sweater leggings XOXO. Retro roof party chambray sustainable Austin, messenger bag bitters freegan locavore meggings wolf swag distillery fanny pack lo-fi. Tonx umami ennui, kitsch PBR raw denim hella DIY cliche Banksy flexitarian VHS Intelligentsia. Fingerstache artisan VHS twee. Wolf kitsch drinking vinegar, Blue Bottle umami yr four loko fingerstache street art pug Godard photo booth tousled.
</p>
    <p>
Salvia photo booth direct trade Austin cardigan hoodie. Plaid kitsch DIY gentrify. Organic small batch Brooklyn dreamcatcher Cosby sweater. Chambray post-ironic four loko, deep v chillwave keffiyeh seitan cred put a bird on it gastropub beard gluten-free pickled Thundercats. Roof party mustache trust fund, viral Bushwick XOXO vegan. Keffiyeh chillwave drinking vinegar, readymade YOLO church-key sustainable jean shorts craft beer iPhone slow-carb dreamcatcher wolf letterpress salvia. Ethnic lomo Carles Blue Bottle.
</p><p>
Quinoa PBR&B art party, banjo chia VHS put a bird on it viral church-key post-ironic Cosby sweater beard pickled. McSweeney's lo-fi DIY butcher gentrify small batch. XOXO Portland next level Blue Bottle before they sold out art party. Helvetica McSweeney's irony, paleo raw denim sriracha Williamsburg small batch scenester mlkshk 3 wolf moon cliche plaid. Salvia tattooed gastropub, hella Odd Future pork belly shabby chic farm-to-table synth tote bag cred. Next level vegan meh cliche, fixie put a bird on it normcore Neutra asymmetrical Thundercats. PBR&B skateboard Odd Future irony, Banksy mustache roof party mumblecore YOLO actually.
    </p>
  </div>
</div>
!

CSS 

              
                /****  Variables  ****/

@white: #efefef;
@orange: tomato;

@height: 200px;

/****  Base  ****/

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: @white;
  font-family: arial;
  font-size: 18px;
}

p {
  margin-bottom: 40px;
  
  &:last-child {
    margin-bottom: 0px;
  }
}

h1, h2, h3 {
  margin: 10px 0 20px 0;
}


/****  Header  ****/

.header {
  background: @orange;
  height: @height;
  color: @white;
}

.header-fixed {
  @fixedHeight: 40px;
  background: @orange;
  font-size: 14px;
  position: fixed;
  line-height: @fixedHeight;
  height: @fixedHeight;
  text-indent: 20px;
  width: 100%;
}

.header-notFixed {
  line-height: @height;
  text-align: center;
  font-size: 28px;
  
  p {
    z-index: 9999;
    position: relative;
  }
}

/****  Content  ****/

.content {
  width: 80%;
  max-width: 1200px;
  background: #ffffff;
  margin: 150px auto;
  min-height: 700px;
  padding: 100px;
  color: #444;
}
!

JS
!
999px

Console