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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

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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

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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

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>
<li><a href="#someanchor">SCROLL SOMEWHERE</a></li>    
<li><a href="#anotheranchor">SCROLL SOMEWHERE ELSE</a></li>  
</ul>


<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus iaculis mauris sed enim tincidunt iaculis. Morbi nec elit hendrerit, dictum erat vitae, porta urna. Donec dignissim congue molestie. Cras pretium eros eu tortor consequat ornare. Pellentesque commodo arcu metus, eget scelerisque metus cursus sit amet. Praesent quis iaculis orci. Sed viverra laoreet arcu ac vestibulum. Nunc vitae malesuada purus. Ut quam erat, facilisis a vulputate eget, porta non felis. Aenean vitae massa non elit vehicula vestibulum. Proin porta, augue sit amet efficitur mollis, augue nulla porta velit, porttitor commodo dolor neque nec magna.</p>

<p>Vestibulum at neque urna. Ut luctus risus mauris, non ornare elit lobortis ut. In varius magna a velit consectetur, vitae ultricies erat tempor. Aenean luctus varius eros, ut venenatis arcu hendrerit eu. Vivamus quis tellus at nisi tincidunt porttitor. Nunc ligula neque, interdum id velit non, venenatis porttitor nulla. Quisque at felis vitae sem semper mollis. Aliquam eget viverra mi. Maecenas ultricies sem sit amet tellus accumsan, non faucibus eros pulvinar. Phasellus at nunc ipsum.</p>

  <h3 id="someanchor">SOMEWHERE</h3>
  <p>Mauris id orci quis lacus molestie imperdiet eget non tellus. Vestibulum non dui pharetra, mollis mauris id, rhoncus dolor. Nulla eros magna, sollicitudin eu felis at, blandit imperdiet dui. Nam facilisis risus metus, in pulvinar erat rutrum interdum. Nam at scelerisque turpis. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur vitae nisi eu justo dapibus laoreet. Vivamus purus dui, ultricies quis velit elementum, dapibus convallis arcu. Duis et finibus lectus. Sed a fringilla metus. Nullam lobortis lacinia elit in lacinia. Aliquam metus lorem, luctus non ultrices malesuada, luctus eu ipsum. Etiam id fringilla augue, a sollicitudin nunc.</p>

<p>Morbi ut mi fringilla, facilisis sapien a, malesuada nisl. Praesent ac facilisis magna. Morbi aliquet ex urna, at porttitor augue efficitur et. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aliquam ornare diam nisl, ac tincidunt sapien tristique et. Vivamus a enim lorem. Donec in arcu in augue dignissim ultrices ut eu massa. Maecenas rhoncus sem quis massa pretium blandit. Donec eget luctus magna. Aliquam mattis urna ac purus tempor, non faucibus lectus pulvinar. Curabitur massa lorem, tristique et consequat at, maximus vitae dui.</p>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus iaculis mauris sed enim tincidunt iaculis. Morbi nec elit hendrerit, dictum erat vitae, porta urna. Donec dignissim congue molestie. Cras pretium eros eu tortor consequat ornare. Pellentesque commodo arcu metus, eget scelerisque metus cursus sit amet. Praesent quis iaculis orci. Sed viverra laoreet arcu ac vestibulum. Nunc vitae malesuada purus. Ut quam erat, facilisis a vulputate eget, porta non felis. Aenean vitae massa non elit vehicula vestibulum. Proin porta, augue sit amet efficitur mollis, augue nulla porta velit, porttitor commodo dolor neque nec magna.</p>

<p>Vestibulum at neque urna. Ut luctus risus mauris, non ornare elit lobortis ut. In varius magna a velit consectetur, vitae ultricies erat tempor. Aenean luctus varius eros, ut venenatis arcu hendrerit eu. Vivamus quis tellus at nisi tincidunt porttitor. Nunc ligula neque, interdum id velit non, venenatis porttitor nulla. Quisque at felis vitae sem semper mollis. Aliquam eget viverra mi. Maecenas ultricies sem sit amet tellus accumsan, non faucibus eros pulvinar. Phasellus at nunc ipsum.</p>

 <h3 id="anotheranchor">SOMEWHERE ELSE</h3>
<p>Mauris id orci quis lacus molestie imperdiet eget non tellus. Vestibulum non dui pharetra, mollis mauris id, rhoncus dolor. Nulla eros magna, sollicitudin eu felis at, blandit imperdiet dui. Nam facilisis risus metus, in pulvinar erat rutrum interdum. Nam at scelerisque turpis. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur vitae nisi eu justo dapibus laoreet. Vivamus purus dui, ultricies quis velit elementum, dapibus convallis arcu. Duis et finibus lectus. Sed a fringilla metus. Nullam lobortis lacinia elit in lacinia. Aliquam metus lorem, luctus non ultrices malesuada, luctus eu ipsum. Etiam id fringilla augue, a sollicitudin nunc.</p>

<p>Morbi ut mi fringilla, facilisis sapien a, malesuada nisl. Praesent ac facilisis magna. Morbi aliquet ex urna, at porttitor augue efficitur et. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aliquam ornare diam nisl, ac tincidunt sapien tristique et. Vivamus a enim lorem. Donec in arcu in augue dignissim ultrices ut eu massa. Maecenas rhoncus sem quis massa pretium blandit. Donec eget luctus magna. Aliquam mattis urna ac purus tempor, non faucibus lectus pulvinar. Curabitur massa lorem, tristique et consequat at, maximus vitae dui.</p>
!

CSS
!

JS 

              
                //MDRscroller
console.log("MDRscroller activated");
$(function() {
  $('a[href*="#"]:not([href="#"])').click(function() {
    if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
      var target = $(this.hash);
      target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
      if (target.length) {
        $('html,body').animate({
          scrollTop: target.offset().top
        }, 1000);
        return false;
      }
    }
  });
});
//End MDRscroller
!
999px

Console