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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. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

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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HTML 

              
                <h1>Pseudo-elements</h1>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Autem facilis et eum odit architec
  to, neque repellendus tempora. Debitis adipisci excepturi corrupti consectetur veritatis ducimus, aspernatur placeat cum molestias, accusamus laborum.</p>
<p>Animi distinctio fuga nostrum, debitis corporis veritatis doloremque? Distinctio, eveniet. Rerum, nihil ipsa. Non tenetur earum, sint a placeat vitae adipisci nostrum? Necessitatibus asperiores, voluptatum vel assumenda ratione sit ipsum?</p>
<blockquote>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Eveniet voluptatibus culpa pariatur aut illo blanditiis debitis dolor quas tempora molestias?
<footer>by Lorem Ipsum</footer>
</blockquote>
<p>Rerum totam sequi voluptas exercitationem enim, reiciendis illo. Cumque veritatis alias repellendus tempore tempora. Consequatur repellendus magni rem hic ad aut vel quidem porro quo, ullam deleniti illum asperiores fugiat?</p>
<p>Quibusdam voluptatibus expedita magnam assumenda dolorem incidunt ea? Cumque facilis nobis provident quas magnam eligendi iure, quae assumenda ea nihil, sequi recusandae dolor placeat similique pariatur dolorem. Officia, quod iure.</p>
<div class="container">
<div class="block">
  <h2>Lorem, ipsum dolor.</h2>
  <p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Iure labore facere neque quisquam? Laboriosam, provident.</p>
  <p>Temporibus nostrum soluta, placeat obcaecati inventore quisquam fugit vitae sit saepe dolore labore iure dolor?</p>
  <a href="" class="readmore">Read More</a>
</div>
<div class="block">
  <h2>Libero dignissimos</h2>
  <p>Ad ea quis quam nulla sit voluptas aliquid delectus explicabo. Nam quidem rem temporibus dicta!</p>
  <p>Consequuntur in, eum voluptatibus laborum quod modi commodi doloribus nam ipsum saepe, autem officia odit.</p>
  <a href="" class="readmore">Read More</a>
</div>
<div class="block">
  <h2>Aliquam magni odit</h2>
  <p>Nulla, omnis exercitationem, pariatur veritatis delectus corporis culpa deleniti voluptatibus adipisci distinctio repellat, architecto error.</p>
  <p>Fuga facere modi molestias? Maxime minima similique asperiores obcaecati cum quae commodi sequi unde molestias.</p>
  <a href="" class="readmore">Read More</a>
</div>
</div>
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CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Montserrat');
* {
  box-sizing: border-box;
}
*::selection{
  color: #f00; 
  background: #000; 
}
body {
  width: 90%;
  margin: auto;
  font-family: 'Montserrat', sans-serif;
}
blockquote:first-letter{
 color: red;
 font-size: 2em;
 font-weight: bold;
} 
blockquote footer {
  color: #666;
  font-style: italic;
  text-align: right;
}
p {
  text-indent: 15px;
}
p:first-line {
  color: #0a4;
  font-family: Cambria, serif;
  font-size: 1.2em;
}

.block {
  display: inline-block;
  vertical-align: top;
  width: 30%;
  margin: 40px 3% 20px 0;
  padding: 10px 15px;
  border: 1px solid #ccc;
}
.block:last-child {
  margin-right: 0;
}
h2::before {
  content: "News: ";
  color: #0a4;
  display: inline-block;
  transform: translate(0,-35px);
  font-size: 0.8em; 
  padding-top: 10px;
}
.readmore {
  display: inline-block;
  text-decoration: none;
  font-size: 0.9em;
  background-color: #0a4;
  font-family: Cambria, serif;
  color: #fff;
  padding: 6px 15px;
  border-radius: 4px;
}
.readmore:hover {
  background-color: #0f4;
}
.readmore:after {
 content: " >";
}
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JS
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999px

Console