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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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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

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

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HTML 

              
                <button id="btn1">Toggle View</button>
<div id="content">
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc tellus nunc, scelerisque nec placerat egestas, tempus vel massa. Duis dictum sapien quis sem consequat bibendum. Fusce gravida tortor vitae elementum vehicula. In rhoncus, felis ac interdum molestie, arcu lectus vestibulum nisl, eget pretium mauris lacus commodo nibh. Suspendisse at pharetra augue, et porta justo. Curabitur commodo, tortor ac pharetra facilisis, augue ligula aliquet dui, vitae imperdiet orci nisi id libero. Fusce lacinia quam quis diam tristique, nec placerat nibh ultricies. Quisque interdum placerat lectus, vitae fermentum odio lacinia sodales.</p>

  <p>Aenean bibendum est eget consequat commodo. Vivamus mi orci, tincidunt quis turpis vel, malesuada volutpat magna. Nam consequat eget dolor sollicitudin sagittis. Aenean gravida convallis mauris et pellentesque. Sed viverra mi eu laoreet hendrerit. Nulla congue magna ac risus ullamcorper, ac mollis enim tincidunt. Praesent mollis ligula bibendum dui hendrerit feugiat. Integer in metus odio. Quisque pellentesque tortor pellentesque ipsum placerat dictum. Vivamus vel pharetra ante, non semper augue. Vestibulum eros sapien, suscipit pharetra felis vitae, tempor vestibulum est. Curabitur nisl tellus, iaculis sit amet interdum ut, rutrum eu augue.</p>

  <p>Quisque pretium, orci non sodales fermentum, est justo blandit eros, ac convallis lacus sem ut nulla. Quisque accumsan justo in neque commodo, eget porttitor odio imperdiet. Nam accumsan ligula turpis, eget placerat lorem aliquet ac. Integer sit amet scelerisque nisl. Proin vel dignissim lorem. Mauris lacinia odio et neque feugiat, vitae tempus lorem bibendum. Aenean eros metus, bibendum at lacinia sed, rhoncus in urna. Quisque tincidunt ligula hendrerit, aliquam mauris vel, tempus felis. Fusce rutrum odio non tellus ultricies pharetra. Cras lobortis condimentum sem, eget semper mauris facilisis eget. In lacinia eros a diam interdum, non adipiscing eros tempor.</p>

  <p>Praesent auctor adipiscing nibh vel dapibus. Aliquam ac risus neque. Morbi laoreet dictum mi, eget dignissim libero ullamcorper nec. Vivamus sapien velit, pharetra pretium tellus a, gravida convallis velit. Donec volutpat vel velit et viverra. Nunc dictum id sem sed dictum. Aenean risus tellus, congue a tortor in, condimentum malesuada mauris. Donec velit lectus, facilisis vel justo ullamcorper, volutpat sodales lorem. Donec scelerisque tempor dolor, sed eleifend sem mollis eget. Ut a dui varius, aliquam justo vitae, eleifend erat. Morbi vestibulum, nibh ut hendrerit euismod, libero libero consectetur elit, nec tristique nisi tellus in ante. Ut eleifend, mauris vel ullamcorper rutrum, nibh dolor sollicitudin mi, et semper nisi felis vitae orci. Interdum et malesuada fames ac ante ipsum primis in faucibus. Donec in fringilla elit, pharetra imperdiet felis. Nulla aliquam odio id ante placerat, non volutpat odio pellentesque. Sed eu eros eget arcu rutrum placerat quis vel purus.</p>
</div>
!

CSS 

              
                body
{
  background:#000;
  font:15px "Trebuchet MS", Arial, Helvetica, sans-serif;
	color:#fff;
  margin:0;
}

#content
{
  background:#222;
  border:solid 1px;
  border-radius:10px;
  margin:5px;
  padding:5px;
  text-align:justify;
}
!

JS 

              
                var btn1 = $("#btn1"),
    content = $("#content"),
    text = $("p"),
    minimized = false,
    tl = new TimelineLite({paused:true});

tl
.to(content, .25, {scale:.05, transformOrigin:'0% 80%'})
.to(text, .15, {opacity:0}, 0);

btn1.click(function()
{
  if(!minimized)
  {
    tl.play();
  }
  else
  {
    tl.reverse();
  }
  minimized = minimized ? false : true;
});
!
999px

Console