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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).

Add External Stylesheets/Pens

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

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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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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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About Packages

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.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div class="container-fluid text-center">
  <div class="container-quote">
    <h1><i class="fa fa-quote-left" aria-hidden="true"></i> <span id="quote">Hello World</span></h1>
    <h3 class="by">- <span id="author">v3.3.7</span></h3>
    <hr/>
    <div class="box">
      <a href="#" class="btn btn-twitter" type="button" target="_blank" id="tweet"><i class="fa fa-twitter" aria-hidden="true"></i></a>
      <button class="btn btn-new" type="button" onclick="newQuote()">New Quote</button>
    </div>
  </div>
</div>
!

CSS 

              
                body {
  background-color: #9b9b9b;
}

.container-quote {
  margin: 150px auto;
  padding: 10px;
  border: 1px solid #ecf0f1;
  max-width: 550px;
  border-radius: 7px;
  background-color: white;
  overflow: auto;
}

 .btn-twitter {
  background-color: #bdc3c7;
  color: inherit;
}


.box {
  display: flex;
  justify-content: space-between;
}

.by {
  text-align: right;
}
!

JS 

              
                var quotes = {
  "1":["B. Franklin", "Beware of little expenses. A small leak will sink a great ship."],
  "2":["B. Franklin", "In this world nothing can be said to be certain, except death and taxes."],
  "3":["S. Orman","A big part of financial freedom is having your heart and mind free from worry about the what-ifs of life."],
  "4":["D. Trump","Money was never a big motivation for me, except as a way to keep score. The real excitement is playing the game."],
  "5":["W. Feather","A budget tells us what we can't afford, but it doesn't keep us from buying it."],
  "6":["Winston S. Churchill", "Success is not final, failure is not fatal, It is the courage to continue that counts."],
  "7":["Herman Melville", "It is better to fail in originality than to succeed in imitation."],
  "8":["Colin R. Davis", "The road to success and the road to failure are almost exactly the same."],
  "9":["Henry David Thoreau", "Success usually comes to those who are too busy to be looking for it."],
  "10":["Chris Grosser", "Opportunities don't happen. You create them."],
  "11":["John D. Rockefeller", "Don't be afraid to give up the good to go for the great."],
  "12":["Thomas Jefferson", " find that the harder I work, the more luck I seem to have."]
}

window.onload = function() {
  newQuote();
};

function selecting() {
  return (Math.round(Math.random() * Object.keys(quotes).length)).toString();
}

function newQuote() {
  var select = selecting();
  var quote = quotes[select][1];
  var author = quotes[select][0];
  document.getElementById("quote").innerHTML = quote;
  document.getElementById("author").innerHTML = author;
  var tweetQuote = quote + " - " + author;
  document.getElementById("tweet").setAttribute('href', 'https://twitter.com/intent/tweet?text=' + tweetQuote);
}
!
999px

Console