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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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About the <head>

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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 

              
                <div id="box">
<h1>
  We have here content of a fleeting nature—images that move across the screen of night and that reclaim a direct, if amorphous, experience. The dreams draw awareness towards an illogical interplay of the ephemeral self; as imagined in encounters and negotiations with time and space. This collection offers a distillation of realities and experiences that trace feeling of past, present, future, unknown. 
<img src="https://upload.wikimedia.org/wikipedia/en/0/02/Homer_Simpson_2006.png">
The reality that defines the course of our waking hours might impose limits and discouragements. Therefore, our ability may not be sufficient, within the spectacle that is our contemporary social world, to grasp what is offered on the periphery 
of consciousness.

I chose the most basic form of line drawing to reflect recall of the unconscious. The sequence might circumvent analytic tendencies, and allow us to come to a place that has nothing to do with chronology or a reasonable narrative. 

Perhaps there is no story. There are only clues that allow us some room to wonder.
  
  
</h1>

</div>
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CSS 

              
                h1{
 mix-blend-mode: difference;
 color:white; 
  font-size:9vw;
  font-family:sans-serif;
 
}


#box
{
background-image: url(https://images.unsplash.com/photo-1515697203610-d0513edf9cb4?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=bd428e7688e714f6c98429dc1c18a31f&auto=format&fit=crop&w=654&q=80);
  background-position:fixed;
   width:80%;
  height:700px;
  overflow-y:scroll;
  background-color:black;
  background-position:center;
  background-repeat:no-repeat;
  margin-left:auto;
      margin-right:auto;

}
!

JS
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999px

Console