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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.

!
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.

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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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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="photo-blur"></div>
<div class="photo"></div>

<section>
  <article>
    <p>Bacon ipsum dolor amet meatloaf cow beef bresaola t-bone tail pancetta drumstick rump shoulder. Sausage doner fatback turducken short loin pig chuck. Fatback alcatra pork chop flank tri-tip ball tip turducken. Flank ribeye sirloin, ground round shank pork chop fatback short loin porchetta chicken jowl sausage boudin. Turkey ribeye tenderloin jowl short loin rump pork chop frankfurter t-bone.</p>
    <br />
    <p>Venison ball tip corned beef, drumstick pastrami cow pancetta ham salami andouille prosciutto hamburger turducken pork chop. Ham bresaola chuck shoulder short loin tail frankfurter beef ribs meatball pastrami pork strip steak pork chop. Kielbasa pork chop doner swine, rump shank drumstick ham hock beef. Salami pork rump porchetta. Hamburger biltong tri-tip, swine pork doner leberkas. Meatball cupim tail, sausage beef ribs capicola boudin picanha salami kielbasa. Bacon salami pork, tail pancetta turkey jerky alcatra.</p>
  </article>
</section>
!

CSS 

              
                * {
  box-sizing: border-box;
  }
html,
body {
  width: 100vw;
  height: 100vh;
  overflow-x: hidden;

  color: #fff;
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 10px;
  }
.photo {
  position: fixed;
  width: 100vw;
  height: 100vh;
  background: url(https://i.imgur.com/LesDtGN.jpg) no-repeat center center; 
  background-size: cover;
  }
.photo-blur {
  position: fixed;
  z-index: 1;
  width: 100vw;
  height: 100vh;
  background: url(https://i.imgur.com/FGBZtpL.jpg) no-repeat center center;
  background-size: cover;
  opacity: 0;
  
  &::before {
    content: "";
    position: absolute;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,.3);
    }
  }
section {
  position: absolute;
  z-index: 2;
  top: 0;
  margin-top: 80vh;
  width: 100%;
  background: linear-gradient(rgba(0,0,0,0) 0%, rgba(0,0,0,0.3) 30%, rgba(0,0,0,.5) 50%, rgba(0,0,0,.7) 100%);
  
  article {
    width: 500px;
    margin: 80px auto 40px;

    font-size: 1.5rem;
    font-weight: 100;
    letter-spacing: .09em;
    line-height: 1.6em;
    text-shadow: 0 1px 10px #000;
    }
}
!

JS 

              
                $(window).scroll(function() {
  var blurVal;
  blurVal = $(window).scrollTop() / 150;
  return $(".photo-blur").css("opacity", blurVal);
});
!
999px

Console