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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 URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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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.

If the stylesheet 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 CSS 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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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.

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.

Powered by Algolia
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.

Learn more

+ add another resource

Packages

Add Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import or require. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML Settings

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HTML

            
              <div class="wrapper">
        <div class="menu_top clearfix">
            <ul>
                <li><a href="">Item 01</a></li>
                <li><a href="">Item 02</a></li>
                <li><a href="">Item 03</a></li>
                <li><a href="">Item 04</a></li>
                <li><a href="">Item 05</a></li>
                <li><a href="">Item 06</a></li>
                <li><a href="">Item 07</a></li>
                <li><a href="">Item 08</a></li>
                <li><a href="">Item 09</a></li>
                <li><a href="">Item 10</a></li>
                <li><a href="">Item 11</a></li>
                <li><a href="">Item 12</a></li>
                <li><a href="">Item 13</a></li>
                <li><a href="">Item 14</a></li>
                <li><a href="">Item 15</a></li>
            </ul>
        </div>
    </div>

    <div class="wrapper">
        <p><b>Float</b></p>

        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ducimus eum labore porro quae, recusandae sint. Ab
           ipsa numquam optio ratione voluptate? Adipisci doloribus explicabo fuga fugit magnam minus nihil porro.</p>

        <p>Amet consequatur cum dolores est laboriosam mollitia non nostrum, ratione temporibus voluptas! Accusantium,
           assumenda debitis ducimus harum incidunt libero molestiae mollitia reiciendis vel velit. Esse facere iste
           laboriosam nobis ut!</p>

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           nisi obcaecati officia pariatur possimus praesentium quidem recusandae sed sequi tempore ullam vel,
           voluptas!</p>

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           reiciendis totam vitae voluptatem. Corporis debitis eveniet explicabo ipsa magnam maiores maxime, modi
           natus!</p>

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           vel! A ab mollitia natus quos voluptate! Ab debitis deserunt, ea eveniet repellat similique voluptas!</p>

        <p>Ab aliquid animi debitis dolore esse explicabo fugit hic id, labore laborum magnam quae, repellendus rerum,
           sit velit? Aspernatur assumenda dolor ea facilis, fugiat maiores natus quod sunt totam vitae.</p>

        <p>Dolorum est, expedita facere illo illum libero neque, odio quia repellendus reprehenderit velit voluptate?
           Animi autem, eveniet excepturi exercitationem impedit inventore itaque, molestiae neque perspiciatis
           provident reiciendis reprehenderit repudiandae voluptatum.</p>

        <p>Amet dolore est, eum expedita minima molestias nesciunt odio quidem recusandae, reiciendis tempora ut? Ad
           asperiores delectus hic iste, minima nobis praesentium sunt tenetur? Doloribus est fuga incidunt modi
           temporibus!</p>

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           quidem quo rem veniam. Facilis fugit nobis sed! A asperiores fugiat illum. Dicta eveniet ex optio.</p>

        <p>Alias delectus dignissimos doloremque eaque earum eligendi eos excepturi illo in ipsam labore laudantium
           magnam, maiores molestiae molestias nam nisi numquam obcaecati praesentium quasi quidem quo repudiandae
           sapiente similique soluta?</p>

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           incidunt magni maiores molestiae nam natus nemo neque non quisquam quo saepe sapiente soluta vel veniam
           veritatis voluptate.</p>

        <p>Accusamus cum illo ipsum laboriosam pariatur quae similique ullam unde. A aliquid asperiores aspernatur
           commodi culpa dolor, doloribus ea, earum exercitationem explicabo hic iure iusto maiores quas qui quis
           voluptatibus?</p>

        <p>Consectetur ea enim error facilis iure officia repudiandae sit! Ab asperiores aspernatur cupiditate deleniti
           distinctio doloribus eaque eos, excepturi illum impedit nemo nesciunt quam quasi qui quis repellat
           reprehenderit sequi.</p>

        <p>Cum, expedita, quia. Consequatur facilis harum illo laboriosam maiores officiis placeat praesentium quae quas
           vel! Accusantium aspernatur, aut enim expedita fuga incidunt quibusdam vero. Dicta facilis natus nobis quod
           suscipit.</p>

        <p>Eaque enim magni sapiente? A ab adipisci, aspernatur, assumenda commodi consectetur consequatur, dolorem
           dolorum ea eius eos esse laborum nisi officiis praesentium quaerat quas qui recusandae tenetur vero voluptas
           voluptates!</p>

        <p>Accusantium atque blanditiis consectetur deserunt fuga fugiat harum id, in ipsum iste magni modi nemo
           nesciunt nisi officiis possimus, quisquam reprehenderit, repudiandae sed similique tempora unde velit
           voluptates? Mollitia, numquam?</p>

        <p>Amet excepturi harum nemo sed. In, itaque, repudiandae. Quaerat, quod, temporibus! Adipisci dignissimos
           doloremque eaque eum odit, officiis recusandae saepe sapiente unde velit. Ducimus eius error fugiat, maiores
           quibusdam quis!</p>

        <p>At ex labore laboriosam magni recusandae voluptas? Minima nesciunt sunt voluptatum? Ad aut commodi
           consectetur consequuntur cumque doloremque ducimus, in iste laboriosam laudantium placeat, sed sint sit,
           soluta voluptates voluptatibus.</p>

        <p>Accusantium asperiores beatae cupiditate dicta doloremque eaque earum excepturi facere facilis hic labore,
           laboriosam laborum magnam molestias mollitia natus necessitatibus nulla odit quam quibusdam quod ratione
           reprehenderit sed veniam voluptas?</p>

        <p>A dignissimos explicabo in numquam obcaecati optio reiciendis rem sapiente suscipit voluptate. Earum et fuga
           iste itaque, maxime non placeat qui quibusdam quo vitae. Consequuntur deserunt necessitatibus nulla quos
           voluptate!</p>
    </div>
!

CSS

            
              .wrapper {
    margin: 0 auto;
    width: 600px;
}

.menu_top ul {
    padding: 0;
    margin: 0;
    list-style: none;
}

.menu_top li {
    float: left;
    padding: 5px;
    border: 1px black solid;
}

.clearfix:after {
    content: " ";
    display: table;
    clear: both;
}
!
999px

Console