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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.

!
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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+ add another resource

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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HTML 

              
                <h1>Taking Flight</h1>

<div class="wrapper">
  <div class="content-wrapper">
    <p>Sed posuere consectetur est at lobortis. Maecenas sed diam eget risus varius blandit sit amet non magna. Nullam quis risus eget urna mollis ornare vel eu leo. Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
    
    <div class="image-left">
      <img src="http://farm4.staticflickr.com/3595/3288866270_23cb40f37c_b.jpg" /> 
      Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
    </div>
    
    <p>Maecenas faucibus mollis interdum. Nullam id dolor id nibh ultricies vehicula ut id elit. Aenean lacinia bibendum nulla sed consectetur. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.</p>

    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Nulla vitae elit libero, a pharetra augue. Donec id elit non mi porta gravida at eget metus. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Maecenas sed diam eget risus varius blandit sit amet non magna. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>

<p>Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Donec sed odio dui. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor.</p>

     <div class="image-center">
      <img src="http://farm5.staticflickr.com/4005/4309067117_852662591f_b.jpg" /> 
    </div>
    
    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Nulla vitae elit libero, a pharetra augue. Donec id elit non mi porta gravida at eget metus. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Maecenas sed diam eget risus varius blandit sit amet non magna. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>
    <p>Sed posuere consectetur est at lobortis. Maecenas sed diam eget risus varius blandit sit amet non magna. Nullam quis risus eget urna mollis ornare vel eu leo. Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>

    <p>Maecenas faucibus mollis interdum. Nullam id dolor id nibh ultricies vehicula ut id elit. Aenean lacinia bibendum nulla sed consectetur. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.</p>
    
    <div class="image-right">
      <img src="http://farm4.staticflickr.com/3595/3288866270_23cb40f37c_b.jpg" /> 
      Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.
    </div>

    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Nulla vitae elit libero, a pharetra augue. Donec id elit non mi porta gravida at eget metus. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Maecenas sed diam eget risus varius blandit sit amet non magna. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>

<p>Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Donec sed odio dui. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor.</p>
    <p>Sed posuere consectetur est at lobortis. Maecenas sed diam eget risus varius blandit sit amet non magna. Nullam quis risus eget urna mollis ornare vel eu leo. Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>

    <p>Maecenas faucibus mollis interdum. Nullam id dolor id nibh ultricies vehicula ut id elit. Aenean lacinia bibendum nulla sed consectetur. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.</p>

    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Nulla vitae elit libero, a pharetra augue. Donec id elit non mi porta gravida at eget metus. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Maecenas sed diam eget risus varius blandit sit amet non magna. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>

<p>Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Donec sed odio dui. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor.</p>
    <p>Sed posuere consectetur est at lobortis. Maecenas sed diam eget risus varius blandit sit amet non magna. Nullam quis risus eget urna mollis ornare vel eu leo. Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>

    <p>Maecenas faucibus mollis interdum. Nullam id dolor id nibh ultricies vehicula ut id elit. Aenean lacinia bibendum nulla sed consectetur. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.</p>

    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Nulla vitae elit libero, a pharetra augue. Donec id elit non mi porta gravida at eget metus. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Maecenas sed diam eget risus varius blandit sit amet non magna. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>

<p>Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Donec sed odio dui. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor.</p>
    <p>Sed posuere consectetur est at lobortis. Maecenas sed diam eget risus varius blandit sit amet non magna. Nullam quis risus eget urna mollis ornare vel eu leo. Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>

    <p>Maecenas faucibus mollis interdum. Nullam id dolor id nibh ultricies vehicula ut id elit. Aenean lacinia bibendum nulla sed consectetur. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.</p>

    <p>Maecenas sed diam eget risus varius blandit sit amet non magna. Nulla vitae elit libero, a pharetra augue. Donec id elit non mi porta gravida at eget metus. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Maecenas sed diam eget risus varius blandit sit amet non magna. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>

<p>Nullam quis risus eget urna mollis ornare vel eu leo. Nulla vitae elit libero, a pharetra augue. Donec sed odio dui. Sed posuere consectetur est at lobortis. Curabitur blandit tempus porttitor.</p>
  </div>
</div>
!

CSS 

              
                @import compass

@import url(https://fonts.googleapis.com/css?family=PlayfairDisplay)

@mixin ease
  +transition-property(all)
  +transition-duration(.6s)
  +transition-timing-function(ease-in)

*
  +box-sizing(border-box)
body
  background: url('http://farm4.staticflickr.com/3485/3288052387_716d3696d8_o.jpg') no-repeat
  background-size: 100%
  background-position: top center
  margin: 0
  padding: 0
  background-attachment: fixed
  font-size: 22px
  line-height: 32px
  color: #333333
  font-family: Playfair Display, Serif
nav
  background: #ffffff
  position: fixed
  top: 0
  left: 0
  width: 100%
  z-index: 9999
  border-bottom: 1px solid #333333
  .inner
    width: 60%
    margin: 0 auto
  ul
    float: right
    li
      display: inline
      margin: 0 0 0 50px
h1
  font-size: 120px
  text-align: center
  font-family: helvetica, sans-serif
  text-transform: uppercase
  color: #ffffff
  margin: 25% 0
  @media (max-width: 800px)
    font-size: 60px
a
  text-decoration: none
  color: #34495e
  &:hover
    color: #2c3e50
    text-decoration: underline
img
  width: 100%
.wrapper
  background: #ffffff
  width: 100%
  min-height: 100%
  margin: 0 0 0 0
  position: relative
.content-wrapper
  width: 80%
  margin: auto
  padding: 10%
  @media (max-width: 640px)
    width: 100%
    padding: 10% 2%
  &:first-letter
    font-size: 80px
  .image-right
    padding: 5% 0 5% 5%
    width: 50%
    float: right
    opacity: .8
    @include ease
    font-size: 80%
    font-style: italic
    line-height: 20px
    @media (max-width: 900px)
      width: 100%
      float: left
      padding: 0 0 5% 0
    img 
      margin: 0 0 10px 0
    &:hover
      opacity: 1
  .image-left
    padding: 5% 5% 5% 0
    width: 50%
    float: left
    opacity: .8
    @include ease
    font-size: 80%
    font-style: italic
    line-height: 20px
    @media (max-width: 900px)
      width: 100%
      padding: 0 0 5% 0
    img 
      margin: 0 0 10px 0
    &:hover
      opacity: 1
  .image-center
    padding: 5% 0
    width: 169%
    position: relative
    margin-left: -35%
    @media (max-width: 640px)
      width: 127%
      margin-left: -13%
!

JS
!
999px

Console