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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

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.

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HTML 

              
                <ul class="content">
  <li>
    <h2><a href="https://cupcakeipsum.com/">Cupcake Ipsum</a></h2>
    <p>Cupcake ipsum dolor sit amet sesame snaps jelly candy canes donut. Wafer gingerbread tootsie roll shortbread pie. Brownie dragée dessert gummies croissant oat cake cookie. Chocolate bar jujubes icing tootsie roll brownie.</p>
    <p>Jelly beans ice cream candy bear claw carrot cake pie oat cake macaroon. Cupcake marshmallow carrot cake cupcake marzipan. Lemon drops caramels tootsie roll gingerbread bear claw bear claw jelly sweet.</p>
  </li>
  
  <li>
    <h2><a href="http://herpderpsum.com/">Herp Derpsum</a></h2>
    <p>Herp derpsum sherp cerp herpsum derpy tee. Derps de se derp sherp sherlamer terpus. Tee merp perp herpem derperker. Derpsum merp le perper sherp zerpus. Herpderpsmer sherper re perp dippy derpy derp derpsum.</p>
    <p>Ner sherlamer derps perp. Herpderpsmer derperker perper sherpus! Sherlamer zerpus er perp derpy derps pee terp. De pee zerpus cerp. Herpy terpus herp ner derpler! Jerpy herpderpsmer re! Derpy dippy diddium.</p>
  </li>

  <li>
    <h2><a href="http://saganipsum.com/">Sagan Ipsum</a></h2>
    <p>Hypatia tingling of the spine a mote of dust suspended in a sunbeam Apollonius of Perga the only home we've ever known culture. Stirred by star stuff harvesting star light descended from astronomers rich in mystery.</p>
    <p>With pretty stories for which there's little good evidence preserve and cherish that pale blue dot emerged into consciousness a still more glorious dawn awaits vastness is bearable only through love take root and flourish.</p>
  </li>

  <li>
    <h2><a href="https://baconipsum.com/">Bacon Ipsum</a></h2>
    <p>Bacon ipsum dolor amet doner turkey tenderloin tri-tip spare ribs brisket short ribs turducken ribeye rump shankle frankfurter beef meatball. Hamburger filet mignon jerky flank shoulder, pork spare ribs bresaola buffalo.</p>
    <p>Strip steak drumstick meatloaf porchetta swine, tongue fatback ball tip. Rump chislic kevin filet mignon burgdoggen chuck, strip steak brisket ground round andouille. Landjaeger meatloaf buffalo chuck frankfurter sirloin.</p>
  </li>

  <li>
    <h2><a href="http://nietzsche-ipsum.com/">Nietzsche Ipsum</a></h2>
    <p>Law inexpedient noble reason abstract revaluation war salvation snare burying merciful love inexpedient strong. Inexpedient prejudice ideal victorious deceptions good holiest. Faithful philosophy endless fearful enlightenment.</p>
    <p>Right depths philosophy derive society insofar chaos intentions joy. Morality moral war eternal-return depths sea morality noble free disgust sea zarathustra. Moral ubermensch battle prejudice ultimate ascetic.</p>
  </li>
  
  <li>
    <h2><a href="https://makesum.com/viking">Viking Ipsum</a></h2>
    <p>Axes skald lack horns terror, Northumbria swords besta Leif Erikson the kracken. Kleppstad pax bjorn the chair Ragnar Lothbrok sailing, raiding runic Leif Erikson sea Thor. King Alfred pax sailing horns loot Dane.</p>
    <p>Hej kura tall blond women berserker ocean Beowulf Beowulf malm the kracken. Skald terror rune Northumbria, kallax Beowulf swords Beowulf malm besta kura longship. Besta loot Northumbria berserker Uppsala.</p>
  </li>
</ul>
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CSS 

              
                body {
  font-family: Arial, sans-serif;
}

li {
  background: #f7f7f7;
  padding: 20px;
  display: grid;
  gap: 1em;
}

.content {
  display: grid;
  gap: 20px;
  margin: 0;
  list-style: none;
  padding: 20px;
}

p, h2 {margin: 0;}

.pagination {
  text-align: center;
  margin-top: 20px;
}

.pagination button {
  padding: 5px 10px;
  margin: 0 5px;
  cursor: pointer;
  outline: 1px solid #494a4f;
  border-radius: 1px;
  border: none;
}

.hidden {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.pagination button.active {
  background-color: #007bff;
  color: white;
}

a {
  color: #2196F3;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}
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JS 

              
                document.addEventListener('DOMContentLoaded', function () {
  const content = document.querySelector('.content'); 
  const itemsPerPage = 2; // set number of items per page
  let currentPage = 0;
  const items = Array.from(content.getElementsByTagName('li')).slice(0);

function showPage(page) {
  const startIndex = page * itemsPerPage;
  const endIndex = startIndex + itemsPerPage;
  items.forEach((item, index) => {
    item.classList.toggle('hidden', index < startIndex || index >= endIndex);
  });
  updateActiveButtonStates();
}

function createPageButtons() {
  const totalPages = Math.ceil(items.length / itemsPerPage);
  const paginationContainer = document.createElement('div');
  const paginationDiv = document.body.appendChild(paginationContainer);
  paginationContainer.classList.add('pagination');

  // Add page buttons
  for (let i = 0; i < totalPages; i++) {
    const pageButton = document.createElement('button');
    pageButton.textContent = i + 1;
    pageButton.addEventListener('click', () => {
      currentPage = i;
      showPage(currentPage);
      updateActiveButtonStates();
    });

      content.appendChild(paginationContainer);
      paginationDiv.appendChild(pageButton);
    }
}

function updateActiveButtonStates() {
  const pageButtons = document.querySelectorAll('.pagination button');
  pageButtons.forEach((button, index) => {
    if (index === currentPage) {
      button.classList.add('active');
    } else {
      button.classList.remove('active');
    }
  });
}

  createPageButtons(); // Call this function to create the page buttons initially
  showPage(currentPage);
});
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999px

Console