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HTML

About HTML Preprocessors

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

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).

Add External Stylesheets/Pens

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About External Resources

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.

Add External Scripts/Pens

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About External Resources

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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

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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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HTML 

              
                <div class="wrapper">
  <h2>Using <code>background-attachment: local</code> on a background image</h2>
  <figure id="demoCallout" class="callout">
    <p><code>background-attachment: local</code> is applied to the CSS box with a background image. Background images now move along the space they occupy.</p>
  </figure>
  <div id="demoAndCodeSnippetBox">

    <div id="demoBox">
      <div id="overlay">
        <h2>Some Additional Content</h2>
        <p>
          Powder caramels sweet lemon drops dragée shortbread lemon drops wafer. Bonbon apple pie cookie caramels soufflé chocolate. Jujubes chupa chups marzipan sweet sesame snaps cake sesame snaps pie icing. Chupa chups macaroon cotton candy danish bear claw candy. Cake brownie dessert halvah carrot cake liquorice cotton candy wafer. Candy canes marzipan ice cream apple pie gummies cheesecake candy canes cookie. Apple pie bonbon chocolate bar muffin sweet sesame snaps. Jelly liquorice lemon drops bonbon carrot cake lemon drops gummies caramels tootsie roll. Lollipop jelly-o cookie brownie tootsie roll sweet roll oat cake sweet. Dragée marshmallow fruitcake brownie pudding powder tart apple pie shortbread. Pie gummi bears candy canes cupcake powder shortbread. Cake toffee bear claw caramels cake shortbread halvah pie cheesecake.
        </p>

        <p>
          Marshmallow powder tart icing donut donut chocolate cake gummi bears halvah. Gingerbread gingerbread donut dragée sweet roll tootsie roll soufflé soufflé. Cotton candy lollipop tiramisu jelly candy tootsie roll. Cupcake cake brownie fruitcake marzipan tootsie roll. Fruitcake icing lollipop chupa chups tart. Cake tootsie roll gummi bears chocolate gummi bears sesame snaps lemon drops gummi bears. Halvah cotton candy oat cake soufflé biscuit marzipan gummi bears pudding. Tiramisu brownie pie marzipan cupcake carrot cake ice cream chocolate bar. Jelly dragée cotton candy icing powder croissant. Candy apple pie chocolate bar chocolate pudding chocolate bar tart. Shortbread bear claw jelly beans pudding toffee donut wafer cupcake. Sugar plum halvah toffee marzipan jelly beans bonbon lollipop. Cake cupcake jujubes pastry danish muffin donut.
        </p>

      </div>
    </div>
    <div id="textContent">

      <p>
        Croissant cotton candy apple pie cheesecake cake. Chocolate cake carrot cake cupcake tart jelly-o croissant tiramisu biscuit pie. Tart danish danish danish tart icing chocolate chupa chups. Chupa chups caramels gummi bears jujubes biscuit cheesecake cheesecake. Chocolate marzipan danish shortbread fruitcake jelly beans macaroon tootsie roll candy. Candy canes jelly-o topping jujubes lollipop gummies apple pie lollipop fruitcake.</p>

      <p>
        Shortbread marshmallow jelly-o fruitcake lemon drops sweet roll pudding. Pastry muffin marzipan cake toffee candy canes tiramisu. Liquorice bear claw wafer topping tootsie roll chocolate bar bear claw. Danish chocolate jelly jelly-o powder. Chupa chups bonbon powder tart powder oat cake wafer. Powder sesame snaps toffee chocolate dessert marshmallow cookie marshmallow chupa chups. Croissant cake gummi bears pastry gummi bears gummi bears lemon drops cheesecake cake. Liquorice pie pudding chocolate dragée wafer cupcake. Liquorice wafer brownie topping lollipop jelly. Candy canes carrot cake chocolate bar gummi bears lemon drops marshmallow soufflé fruitcake.</p>

      <p>
        Bear claw bear claw candy tootsie roll topping marzipan biscuit. Chocolate cake ice cream macaroon powder chocolate cotton candy cookie lollipop. Ice cream chocolate cake sugar plum brownie marshmallow wafer icing. Jelly donut lollipop macaroon sweet sweet apple pie toffee sesame snaps. Tootsie roll toffee chupa chups dragée tootsie roll cake. Fruitcake lemon drops pie gingerbread chocolate bar cheesecake. Chocolate cake marzipan gummies pie macaroon sugar plum carrot cake marshmallow sesame snaps. Fruitcake jelly beans lemon drops bonbon muffin toffee fruitcake carrot cake. Sesame snaps shortbread jujubes lollipop caramels tootsie roll. </p>

      <p>
        Pastry jelly-o sweet jelly-o jelly muffin. Gingerbread powder chocolate chocolate fruitcake cake pie danish. Fruitcake sweet lemon drops icing oat cake muffin shortbread cupcake. Bonbon gingerbread marshmallow cake icing ice cream. Shortbread topping candy canes soufflé tart dessert cupcake sugar plum pastry. Tootsie roll danish liquorice macaroon candy canes sesame snaps. Lollipop lollipop tootsie roll marshmallow candy.</p>

      <p>
        Sesame snaps shortbread muffin tiramisu carrot cake wafer liquorice. Macaroon toffee marzipan toffee marshmallow tootsie roll pudding chupa chups bear claw. Dessert cupcake chocolate cookie soufflé. Sweet sweet roll oat cake candy brownie ice cream donut. Sesame snaps icing marshmallow lollipop dragée. Cotton candy gummies gummi bears topping sweet marzipan croissant gummi bears sesame snaps. Candy canes liquorice wafer donut soufflé chupa chups. </p>

      <p>
        Topping sugar plum fruitcake gingerbread chocolate marshmallow bear claw soufflé shortbread. Tart danish cupcake tiramisu dessert bonbon. Croissant jelly beans toffee cotton candy bear claw donut croissant. Cupcake sweet biscuit icing cookie. Soufflé soufflé candy canes cotton candy oat cake lemon drops icing. Soufflé bonbon danish gingerbread sugar plum. Lemon drops pudding soufflé topping tootsie roll halvah dessert jelly. Soufflé cookie sweet cheesecake chupa chups fruitcake soufflé. </p>

      <p>
        Brownie cookie tiramisu lemon drops cotton candy cookie. Jelly-o cotton candy jelly beans jelly beans jujubes caramels toffee. Jelly carrot cake marzipan bonbon candy canes oat cake. Cake candy canes bonbon chupa chups jelly chocolate bar wafer dessert. Gummies bear claw lollipop cupcake marshmallow. Oat cake toffee pastry apple pie topping. Bear claw bonbon marshmallow cupcake apple pie wafer jelly beans tootsie roll soufflé. </p>

      <p>
        Caramels toffee candy canes soufflé toffee cake. Shortbread tiramisu brownie powder oat cake cheesecake chocolate cake. Croissant icing fruitcake liquorice sweet roll. Caramels danish pastry topping topping marshmallow danish bonbon cookie. Candy gummi bears jelly beans wafer chocolate cake tiramisu sweet gingerbread. Sweet roll sesame snaps cookie candy gummies lemon drops. Topping jelly candy canes pastry halvah pastry. Soufflé marshmallow tiramisu lollipop pastry. </p>

      <p>
        Icing tart chocolate bar jujubes candy jujubes. Chocolate bar ice cream candy canes pastry sugar plum cotton candy ice cream. Pudding chupa chups cookie candy wafer sesame snaps dragée sweet pudding. Macaroon lollipop pie bonbon chocolate jelly icing muffin. Tart cake bear claw tootsie roll candy toffee. Biscuit liquorice sweet tart jelly beans icing. Macaroon lemon drops powder lemon drops halvah. Jelly beans donut sugar plum chocolate candy topping marshmallow sesame snaps chupa chups. </p>

      <p>
        Pudding jelly-o pudding cake muffin dragée lemon drops. Jelly beans tootsie roll bear claw cookie apple pie marshmallow cookie bonbon. Powder danish biscuit sweet apple pie. Toffee oat cake tiramisu gummi bears chocolate cake croissant chocolate bar. Fruitcake cotton candy ice cream cake icing. Cake biscuit jelly sesame snaps jelly-o chocolate bar macaroon. Macaroon marshmallow gingerbread marshmallow chocolate cake jujubes. Wafer oat cake cheesecake cotton candy powder gingerbread cake sweet shortbread. Sugar plum toffee croissant liquorice gummies cookie donut jujubes ice cream. </p>

      <p>
        Halvah gummies sesame snaps marzipan jelly beans cotton candy lollipop halvah bonbon. Marzipan biscuit tiramisu powder carrot cake tootsie roll. Topping cookie bonbon donut gingerbread cupcake cake cheesecake. Macaroon jujubes ice cream marzipan cookie bear claw. Bonbon macaroon liquorice cotton candy carrot cake. Caramels chocolate cake marshmallow halvah marshmallow. </p>

      <p>
        Sugar plum icing chocolate ice cream shortbread jujubes sesame snaps chupa chups cotton candy. Cake jelly-o toffee tart soufflé pudding chupa chups bonbon. Cheesecake croissant dessert chocolate cake fruitcake caramels. Gingerbread cookie sesame snaps jujubes bear claw lemon drops candy canes dessert. Jelly chupa chups tootsie roll apple pie shortbread. Sesame snaps jelly jujubes jelly brownie powder gummies chocolate cake. Tiramisu powder toffee pastry jelly cheesecake chocolate cake. Gingerbread lemon drops topping chocolate jujubes muffin topping soufflé. </p>
    </div>
  </div>
</div>
!

CSS 

              
                #textContent p {
  max-width: 100%;
  font-family: "Google Sans Text", "Google Sans", Roboto, Helvetica, sans-serif;
  line-height: 1.4;
}

#textContent p + p {
  margin-top: 1rem;
}

#demoBox {
  position: relative;
  aspect-ratio: 16/9;
  border: 0.5px solid hsla(0deg, 0%, 60%, 0.5);
  width: 100%;
  border: 1px solid hsla(0deg, 0%, 40%, 0.25);
  padding: 1rem;
  /* have background-size be within reason within the bounds of box but still allow regular tiling to occur on applicable images */
  background-image: url("https://images.unsplash.com/photo-1529673203658-56306382b724?auto=format&fit=crop&w=1000&q=80&ar=16:9");
  background-size: cover;
  background-attachment: local;
  overflow: auto;
}

#overlay {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;

  width: 100%;
  height: max-content;
  background: hsla(0deg, 0%, 0%, 0.8);
  padding: 2rem;
  color: white;
  line-height: 1.7;
}

#overlay h2 {
  margin-bottom: 1.25rem;
  color: hsl(236, 53%, 48%);
}

#overlay p + p {
  margin-top: 2rem;
}
!

JS
!
999px

Console