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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.

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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).

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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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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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HTML 

              
                <h1 class="title">Full Width Image with calc()</h1>
<p class="description">Break out of a parent container using <a  href="https://developer.mozilla.org/en-US/docs/Web/CSS/calc">calc()</a>.</p>

<div class="wrap">
  
  <section class="content-section">
    
    <header>
      <h1>This image is full-width, even though the parent container has padding.</h1>
    </header>
    
    <article>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed quid minus probandum quam esse aliquem beatum nec satis beatum? Maximas vero virtutes iacere omnis necesse est voluptate dominante. Mihi enim erit isdem istis fortasse iam utendum. Istam voluptatem, inquit, Epicurus ignorat? Quae in controversiam veniunt, de iis, si placet, disseramus. Duo Reges: constructio interrete. Rhetorice igitur, inquam, nos mavis quam dialectice disputare? Sed virtutem ipsam inchoavit, nihil amplius. </p>      
      <img src="https://unsplash.it/1200/600" class="full-width">
      
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed quid minus probandum quam esse aliquem beatum nec satis beatum? Maximas vero virtutes iacere omnis necesse est voluptate dominante. Mihi enim erit isdem istis fortasse iam utendum. Istam voluptatem, inquit, Epicurus ignorat? Quae in controversiam veniunt, de iis, si placet, disseramus. Duo Reges: constructio interrete. Rhetorice igitur, inquam, nos mavis quam dialectice disputare? Sed virtutem ipsam inchoavit, nihil amplius. </p>
      
      <img src="https://unsplash.it/300/200" class="alignleft">
      
      <p>Aliter enim explicari, quod quaeritur, non potest. Nam ista vestra: Si gravis, brevis; Hoc ipsum elegantius poni meliusque potuit. At multis se probavit. Si est nihil nisi corpus, summa erunt illa: valitudo, vacuitas doloris, pulchritudo, cetera. Nam Pyrrho, Aristo, Erillus iam diu abiecti. </p>
      <p>Sed haec omittamus; Quorum altera prosunt, nocent altera. Et nemo nimium beatus est; </p>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed quid minus probandum quam esse aliquem beatum nec satis beatum? Maximas vero virtutes iacere omnis necesse est voluptate dominante. Mihi enim erit isdem istis fortasse iam utendum. Istam voluptatem, inquit, Epicurus ignorat? Quae in controversiam veniunt, de iis, si placet, disseramus. Duo Reges: constructio interrete. Rhetorice igitur, inquam, nos mavis quam dialectice disputare? Sed virtutem ipsam inchoavit, nihil amplius. </p>

      <img src="https://unsplash.it/300/200" class="alignright">
      
      <p>Deinde dolorem quem maximum? Ita enim vivunt quidam, ut eorum vita refellatur oratio. Si mala non sunt, iacet omnis ratio Peripateticorum. Hoc dictum in una re latissime patet, ut in omnibus factis re, non teste moveamur. Tubulum fuisse, qua illum, cuius is condemnatus est rogatione, P. Sed haec quidem liberius ab eo dicuntur et saepius. Omnium enim rerum principia parva sunt, sed suis progressionibus usa augentur nec sine causa; Sic enim censent, oportunitatis esse beate vivere. Illa tamen simplicia, vestra versuta. </p>
      <p>Aliter enim explicari, quod quaeritur, non potest. Nam ista vestra: Si gravis, brevis; Hoc ipsum elegantius poni meliusque potuit. At multis se probavit. Si est nihil nisi corpus, summa erunt illa: valitudo, vacuitas doloris, pulchritudo, cetera. Nam Pyrrho, Aristo, Erillus iam diu abiecti. </p>
    </article>
    
    <footer>
    </footer>
  
  </section>
  
</div><!-- .wrap -->
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CSS 

              
                .wrap {
    margin: 0 auto;
    max-width: 960px;
    padding: 0 48px;
}

.content-section {
    background-color: #fff;
    margin-bottom: 48px;
    padding: 48px;
    position: relative;
  
  h1 {
      margin-bottom: 48px;
      text-align: center;
  }
}

.full-width {
    position: relative;
    left: -48px;
    width: calc(100% + 96px); // Each gutter is 48px. 48 * 2 = 96
}

// Design stuff for this pen (ignore me)
body { background: #333; color: #333; font-family: sans-serif;	text-align: left; } .title { text-align: center; margin-bottom: 0; color: #fff; text-shadow: 1px 1px 0 #000; } .description { text-align: center; margin-bottom: rem(48); color: #fff; text-shadow: 1px 1px 0 #000; } .alignleft { text-align: left; float: left; margin: 24px 24px 24px 0; } .alignright { text-align: right; float: right; margin: 24px 0 24px 24px; }
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JS
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999px

Console