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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.

!
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

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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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.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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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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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 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.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

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HTML 

              
                <main>
  <article>
    <h1>H1 Heading</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec eleifend semper ligula et rhoncus. Nunc tristique, mi nec facilisis malesuada, leo leo elementum est, id consectetur ex metus non risus. Aliquam sit amet nulla mauris. Fusce vel vestibulum urna. Cras sit amet posuere dui. Morbi nunc quam, dapibus in lectus faucibus, posuere ullamcorper nulla. Nunc id dictum est. Sed et est non diam posuere dictum eget sit amet felis. Nam interdum, metus quis porttitor porta, sem lacus consectetur enim, a vulputate urna nibh id sem.</p>
    <p>Fusce a metus tortor. Curabitur tincidunt venenatis dolor, at molestie orci auctor sed. Curabitur pretium nulla arcu, sed vehicula enim dignissim nec. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Nunc lobortis feugiat mollis. Nullam eleifend, nisi faucibus viverra egestas, dui ex iaculis dui, nec tempor enim elit non nibh. Aliquam et tellus eget dolor tincidunt accumsan at at tellus.</p>
 </article>

  <img src="https://images.unsplash.com/photo-1596295927468-f6404594bfbb?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&auto=format&fit=crop&w=1960&q=80" alt="black & white image">

  <article>
    <p>Vivamus euismod ipsum massa, sed consequat sapien accumsan et. Donec vitae elementum est, quis pharetra sem. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>
    <p>Pellentesque porta ut ipsum et rhoncus. Ut augue elit, porta vel metus eu, mattis dignissim purus. Suspendisse potenti. Donec a porta tellus, eu hendrerit dolor. Phasellus interdum rhoncus mauris et consectetur. Vivamus pretium magna eu turpis vulputate mattis at in nibh. Interdum et malesuada fames ac ante ipsum primis in faucibus.</p>
    <p>Proin consequat nibh ex, sit amet commodo lacus porta eu. Phasellus quis enim et quam ornare fringilla. Aliquam vestibulum pretium ultrices. In cursus feugiat sagittis. Donec posuere dui non lorem bibendum ultrices. Suspendisse in felis nec sem sodales sodales sed non magna. Pellentesque sit amet eleifend erat. Nullam sed commodo lacus. </p>
  </article>

    <div class="auto--grid">
    <img src="https://images.unsplash.com/photo-1596295927468-f6404594bfbb?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&auto=format&fit=crop&w=768&q=80" alt="black & white image">
    <img src="https://images.unsplash.com/photo-1596295927468-f6404594bfbb?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&auto=format&fit=crop&w=768&q=80" alt="black & white image">
    <img src="https://images.unsplash.com/photo-1596295927468-f6404594bfbb?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&auto=format&fit=crop&w=768&q=80" alt="black & white image">
    <img src="https://images.unsplash.com/photo-1596295927468-f6404594bfbb?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&auto=format&fit=crop&w=768&q=80" alt="black & white image">
          <img src="https://images.unsplash.com/photo-1596295927468-f6404594bfbb?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&auto=format&fit=crop&w=768&q=80" alt="black & white image">
    <img src="https://images.unsplash.com/photo-1596295927468-f6404594bfbb?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&auto=format&fit=crop&w=768&q=80" alt="black & white image">
    </div>

  <section>
    <h2>H2 Heading</h2>
    <p>Pellentesque porta ut ipsum et rhoncus. Ut augue elit, porta vel metus eu, mattis dignissim purus. Suspendisse potenti. Donec a porta tellus, eu hendrerit dolor. Phasellus interdum rhoncus mauris et consectetur. Vivamus pretium magna eu turpis vulputate mattis at in nibh. Interdum et malesuada fames ac ante ipsum primis in faucibus. Vivamus luctus, massa eget lacinia consequat, orci ante suscipit felis, eget eleifend enim felis in lacus. Sed hendrerit vel sem sed volutpat.</p>
    <p>Proin consequat nibh ex, sit amet commodo lacus porta eu. Phasellus quis enim et quam ornare fringilla. Aliquam vestibulum pretium ultrices. In cursus feugiat sagittis. Donec posuere dui non lorem bibendum ultrices. Suspendisse in felis nec sem sodales sodales sed non magna. Pellentesque sit amet eleifend erat. Nullam sed commodo lacus. </p>
  </section>
</main>
!

CSS 

              
                :root {
  --gap-unit: 1rem;
}

main *:not(img):not(div) {
  max-width: 65ch;
  margin: 2rem auto;
}

main img {
  display: block;
  max-width: 100%;
}

/* General */
body {
  margin: 0;
  font-family: Arial, sans-serif;
  font-size: 18px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  word-spacing: 0.04em;
}

.centered {
    display: grid;
  place-content: center;
}

article,
section {
  padding: 0 1rem;
}

.auto--grid {
  display: grid;
  grid-template-columns: repeat(
    auto-fill,
    minmax(var(--auto-grid-min-size, 18rem), 1fr)
  );
  grid-gap: var(--gap-unit);
}

@media only screen and (min-width: 768px) {
  .auto--grid {
    --gap-unit: 1.5rem;
  }
}

@media only screen and (min-width: 1220px) {
  .auto--grid {
    --gap-unit: 2rem;
  }
}
!

JS
!
999px

Console