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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

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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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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.

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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.

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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 

              
                <header>
            <nav>
                <ul>
                    <li>Home</li>
                    <li>About</li>
                    <li>Contact</li>
                </ul>
            </nav>
        </header>
        <section id="mainContent">
            <article>
                <h2>Stay Connected</h2>
                <p>By simply leaving the cable plugged in. What did you think would happen when you unplugged it?</p>
            </article>
            <article>
                <h2>Breaking News</h2>
                <p>Have you heard about that new food challenge? You have 5 minutes to down a tray of concrete lasagna and replace all your fluids with soda.</p>
            </article>
            <article>
                <h2>Leading The Industry</h2>
                <p>We really synergize with your financial partners to hit the ground running and get the job done, and we've been doing it for 500 years.</p>
            </article>
            <article>
                <h2>I'm Starting To Get Tired</h2>
                <p>Starting this project at 1am was probably a bad decision.</p>
            </article>
        </section>
        <footer>
            <ul>
                <li>Footer stuff goes here</li>
                <li>Maybe some links?</li>
                <li>Or perhaps a tag cloud!</li>
            </ul>
        </footer>
!

CSS 

              
                /* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}

/*end reset*/

header {
    width:100%;
    padding:0 0 0 20px;
    height:50px;
    position:fixed;
    top:0;
    background:rgba(0,0,0,0.2);
    overflow:hidden;
}

header nav ul li {
    display:inline-block;
    font-family:arial, helvetica, sans-serif;
    font-size:1em;
    color:#eee;
    font-weight:bold;
    margin-right:25px;
    line-height:50px;
}

header ul li:last-of-type {
    margin-right: 0px;
}

section article {
    display:block;
    text-align: center;
    background: linear-gradient(#A00, #800);
    color:#eee;
    border-bottom:3px dashed #eee;
}

section h2 {
    font-size:2em;
    font-weight:bold;
    margin-bottom:15px;
}

section p {
    font-family:arial, helvetica, sans-serif;
    font-size:0.8em;
}

footer {
    width:100%;
    z-index:-1;
    position:fixed;
    left:0;
    bottom:0;
    display:block;
    padding:20px;
    color:#eee;
    text-align: center;
    background: linear-gradient(#000, #333);
    font-family:arial, helvetica, sans-serif;
}

/* breakpoints */
@media screen and (min-width: 1280px) {
    section article {
        height:300px;
        padding:100px 50px;
    }
    section article:last-of-type {
        margin-bottom:420px;
    }
    footer {
        height:380px;
    }
}

@media screen and (min-width: 1024px) and (max-width: 1279px) {
    section article {
        height:300px;
        padding:100px 50px;
    }
    section article:last-of-type {
        margin-bottom:420px;
    }
    footer {
        height:380px;
    }
}

@media screen and (min-width: 768px) and (max-width: 1023px) {
    section article {
        height:200px;
        padding:80px 50px;
    }
    section article:last-of-type {
        margin-bottom:420px;
    }
    footer {
        height:380px;
    }
}

@media screen and (max-width: 767px) {
    section article {
        height:300px;
        padding:80px 50px;
    }
    section article:last-of-type {
        margin-bottom:420px;
    }
    footer {
        height:380px;
    }
}
!

JS
!
999px

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