Pen Settings

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.

Learn more · Versions

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.

Learn more · Versions

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.

Powered by Algolia
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.

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

Learn more · Versions

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.

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

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.

Powered by Algolia
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.

Behavior

Auto Save

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.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

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

Visit your global Editor Settings.

HTML 

              
                
<div id="wrapper">
    <div id="container">

        <section class="open-book">
            <header>
                <h1>Book Layout</h1>
                <h6>Erin E. Sullivan</h6>
            </header>
            <article>
                <h2 class="chapter-title">Waiting on projects</h2>
                <p>
                    Sublime Text 2 was opened and a new document was created. "I love this time of year," Erin gleefully thought to herself.
                </p>
                <p>
                    The "time of year" that is being referenced relates to Erin's job when the pile of projects temporarily slow down. This doesn't happen to just her. The reduction of work happens to many, but at various times throughout the year, depending on their position. She could submit to boredom and brainlessly surf the Internet, but this particular developer decided to take advantage of the situation.
                </p>
                <p>
                    Erin brainstorms on ideas that are both fun and can strengthen her development skills. After all, however she spends her free time at work should be used in a way that becomes helpful for future projects.
                </p>
                <p>
                    She already made quite the effort into fine-tuning her skills with Flexbox, creating functional and accessible code for an <a href="https://codepen.io/erinesullivan/pen/LLoXoL">organizational chart</a> and a <a href="https://codepen.io/erinesullivan/pen/MvOdOE">process chart</a>. For Erin's next personal project, she wanted something different. Something with multiple (yet possibly useful) features.
                </p>
                <p>
                    To <a href="https://codepen.io/">CodePen.io</a> she went, but not brainlessly! Erin "Oohed" and "Ahhed" at the recently picked pens. She envied the skills of those using compilers she has yet to dabble in. Then she put together a list of what she would like to achieve.
                </p>
                <p>
                    Erin chuckled to herself, "This sounds crazy, but what if I develop a section of text that looks like a book?"
                </p>
                <p>
                    She paused, realizing that what she was about to do was a trend years ago. This severely increased the chance of her project being mocked after launch. What was the specific trend Erin remembered? Skeuomorphism.
                </p>
                <dl>
                    <dt><strong>skeu&bull;o&bull;morph</strong></dt>
                    <dd>
                        <em>noun</em><br>
                        an object or feature that imitates the design of a similar artifact made from another material.
                    </dd>
                </dl>
                <p>
                    Outside of skeuomorphism, the idea actually was not very silly. Erin always had an appreciation towards print work. The thought of mimicking similar designs onto a web interface has always fascinated her. So, why not start with the classic print design of a novel?
                </p>
                <p>
                    She began to jot down a list of elements that are typically in a novel:
                </p>
                <ul>
                    <li>Serif typefaces</li>
                    <li>
                        Header area with the title of the book on the left, and the author of said book on the right. <em>Erin is aware that content within the header of the same page as a chapter title does not appear, but she made an exception</em>.
                    </li>
                    <li>An adorned chapter title</li>
                    <li>A dropcap for the first letter of the first paragraph of the chapter</li>
                    <li>Indented paragraphs</li>
                    <li>Page numbers</li>
                </ul>
                <p>
                    She was then picturing herself making marks on a novel like she used to in school. In her true fashion, she got carried away with "What ifs." 
                </p>
                <ul>
                    <li>
                        "What if highlighting the text actually looked <mark>like a highlighter</mark>?"
                        <ul>
                            <li>"What if I wanted it to be <mark class="pink">pink</mark>?"</li>
                            <li>"<mark class="blue">Blue</mark>?"</li>
                            <li>"<mark class="green">Green</mark>?"</li>
                            <li>"<mark class="orange">Orange</mark>?"</li>
                        </ul>
                    </li>
                    <li>"What if I found <s>a typo</s><sup>an error in the content</sup> and wanted to make a correction?"</li>
                    <li>"What if I was viewing this on mobile&mdash;"</li>
                </ul>
                <p>
                    The true obstacle showed its form. Responsiveness. How on Earth will she make this work?
                </p>
                <p>
                    Erin pulled out her notepad and started sketching. First she began to illustrate the wireframe of the book in its entirety. Then she recorded some notes on how each element would break down as the screen size got smaller. After several minutes, the blueprint was complete. She came to the conclusion that mobile viewing must stay minimal. The pages go away, which makes the page numbers no longer have a function so they must go away, and if those go away then there is no need for a cover since it is used to help hold and protect pages.
                </p>
                <p>
                    She looks back at the blinking cursor of her blank canvas in Sublime Text 2. Doubt begins to linger in the back of her mind with the thought of her new code never being used and her time spent ends up being a waste. Her fingers were typing anyway.
                </p>
                <p>
                    Erin smirked, "Well at least I think it's worth a try."
                </p>
            </article>
            <footer>
                <ol id="page-numbers">
                    <li>1</li>
                    <li>2</li>
                </ol>
            </footer>
        </section>

    </div>
</div>
!

CSS 

              
                
@import url(https://fonts.googleapis.com/css?family=Crimson+Text:400,700,900,400italic,700italic,900italic|Playfair+Display:400,700,900,400italic,700italic,900italic|Rock+Salt:400);

*,
:before,
:after {
    box-sizing: border-box;
}

body {
    background-color: #1d1f20;
    color: #e5e5e5;
    font: 16px/1.25 'Crimson Text', sans-serif;
    margin: 0;
}

#wrapper {
    margin-left: auto;
    margin-right: auto;
    max-width: 80em;
}

#container {
    float: left;
    padding: 1em;
    width: 100%;
}



/*** OPEN BOOK ***/
.open-book {
    background: #fff;
    box-shadow: rgba(0,0,0,0.5) 0 1em 3em;
    color: #000;
    padding: 2em;
}

.open-book * {
    position: relative;
}

/* Highlight */
.open-book *::-moz-selection {
    background: rgba(222,255,0,0.75);
}

.open-book *::selection {
    background: rgba(222,255,0,0.75);
}

/* Header/Footer */
.open-book header {
    padding-bottom: 1em;
}

.open-book header *,
.open-book footer * {
    font: 700 1em/1.25 'Playfair Display', sans-serif;
    letter-spacing: 0.125em;
    margin: 0;
}

.open-book header * {
    font-size: 0.75em;
    text-transform: uppercase;
}

.open-book footer {
    padding-top: 1em;
}

.open-book footer #page-numbers {
    display: none;
    list-style: none;
    padding: 0;
    text-align: left;
}

.open-book footer #page-numbers > li:last-child {
    text-align: right;
}

/* Chapter Title */
.open-book .chapter-title {
    background: ;
    background-size: 0.5em 0.5em;
    font: 700 7vw/1.25 'Playfair Display', sans-serif;
    letter-spacing: 0.125em;
    margin: 0 0 1em 0;
    padding: 1em 0;
    position: relative;
    text-align: center;
    text-transform: uppercase;
}

.open-book .chapter-title:before,
.open-book .chapter-title:after {
    border: solid 0 #000;
    border-width: 0.05em 0;
    bottom: calc((0.125em / 2) * 3);
    content: '';
    height: 0.15em;
    position: absolute;
    width: calc(50% - (1em / 2));
}

.open-book .chapter-title:before {
    left: 0;
}

.open-book .chapter-title:after {
    right: 0;
}

/* Body Copy */
.open-book article {
    line-height: 1.5;
}

.open-book article *:not(.chapter-title):not(hr):not(dl) {
    margin: 0 auto;
    max-width: 28.125em;
}

.open-book article p {
    text-indent: 2em;
}

.open-book .chapter-title + p:first-of-type {
    text-indent: 0;
}

.open-book .chapter-title + p:first-of-type:first-letter {
    float: left;
    font: 700 3em/0.65 'Playfair Display', sans-serif;
    padding: 0.15em 0.05em 0 0;
    text-transform: uppercase;
}

.open-book article > ul,
.open-book article > ol {
    padding-left: 3em;
}

.open-book article > ul ul {
    padding-left: 1em;
}

.open-book a {
   
    background-size: auto 0.5em;
    color: rgba(0,0,0,0.5);
    text-decoration: none;
}

.open-book sup {
    color: #cc0000;
    font-family: 'Rock Salt', cursive;
    left: 0;
    margin-top: -1em!important;
    max-width: 100%!important;
    position: absolute;
    text-align: center;
    width: 100%;
}

.open-book mark {
    background: linear-gradient(to bottom, rgba(222,255,0,1) 0%,rgba(222,255,0,0.5) 60%,rgba(222,255,0,1) 100%);
}

.open-book mark.pink {
    background: linear-gradient(to bottom, rgba(255,69,190,1) 0%,rgba(255,107,203,0.5) 60%,rgba(255,107,203,1) 100%);
}

.open-book mark.blue {
    background: linear-gradient(to bottom, rgba(73,179,255,1) 0%,rgba(107,193,255,0.5) 60%,rgba(107,193,255,1) 100%);
}

.open-book mark.green {
    background: linear-gradient(to bottom, rgba(67,226,15,1) 0%,rgba(39,229,54,0.5) 60%,rgba(39,229,54,1) 100%);
}

.open-book mark.orange {
    background: linear-gradient(to bottom, rgba(255,134,9,1) 0%,rgba(255,177,34,0.5) 60%,rgba(255,177,34,1) 100%);
}

.open-book hr {
    background-color: #000;
    border: 0;
    height: 2px;
    margin: 1em 0;
}

.open-book dl {
    border: solid 0 #ccc;
    border-width: 0.0625em 0;
    break-inside: avoid-column;
    margin: 1em auto;
    padding: 1em 0;
}



/*** MEDIA QUERIES ***/
@media only screen and ( min-width: 50em ) {

    .open-book {
        margin: 1em;
        position: relative;
    }

    .open-book:before {
        background-color: #8B4513;
        border-radius: 0.25em;
        bottom: -1em;
        content: '';
        left: -1em;
        position: absolute;
        right: -1em;
        top: -1em;
        z-index: -1;
    }

    .open-book:after {
        background: linear-gradient(to right, transparent 0%,rgba(0,0,0,0.2) 46%,rgba(0,0,0,0.5) 49%,rgba(0,0,0,0.6) 50%,rgba(0,0,0,0.5) 51%,rgba(0,0,0,0.2) 52%,transparent 100%);
        bottom: -1em;
        content: '';
        left: 50%;
        position: absolute;
        top: -1em;
        transform: translate(-50%,0);
        width: 4em;
        z-index: 1;
    }

    .open-book > * {
        column-count: 2;
        column-gap: 6em;
        position: relative;
        z-index: 1;
    }

    /* Header/Footer */
    .open-book header:before,
    .open-book header:after,
    .open-book footer:before,
    .open-book footer:after {
        background: #fff;
        border-radius: 25%;
        content: '';
        height: 2em;
        position: absolute;
        z-index: -1;
        width: calc(50% + 2em);
    }

    .open-book header:before,
    .open-book footer:before,
    .open-book footer:after {
        border-top-left-radius: 0;
    }

    .open-book header:after,
    .open-book footer:before,
    .open-book footer:after {
        border-top-right-radius: 0;
    }

    .open-book header:before,
    .open-book header:after,
    .open-book footer:after {
        border-bottom-right-radius: 0;
    }

    .open-book header:before,
    .open-book header:after,
    .open-book footer:before {
        border-bottom-left-radius: 0;
    }

    .open-book header:before,
    .open-book header:after {
        top: -2.65em;
    }

    .open-book header:before,
    .open-book footer:before {
        right: 50%;
    }

    .open-book header:before {
        transform: rotate(-2deg);
    }

    .open-book header:after,
    .open-book footer:after {
        left: 50%;
    }

    .open-book header:after {
        transform: rotate(2deg);
    }

    .open-book footer:before,
    .open-book footer:after {
        bottom: -2.65em;
    }

    .open-book footer:before {
        transform: rotate(2deg);
    }

    .open-book footer:after {
        transform: rotate(-2deg);
    }

    .open-book header > *:last-child,
    .open-book footer > *:last-child {
        text-align: right;
    }

    .open-book footer #page-numbers {
        display: block;
    }

    /* Chapter Title */
    .open-book .chapter-title {
        font-size: 3em;
    }

    .open-book .chapter-title:before,
    .open-book .chapter-title:after {
        height: 0.125em;
    }

    /* Body Copy */
    .open-book article p {
        text-indent: 3em;
    }

    .open-book article > ul,
    .open-book article > ol {
        padding-left: 4em;
    }

}
!

JS
!
999px

Console