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HTML

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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

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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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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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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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HTML 

              
                <h1>Image Gallery</h1>
    
    <div class="container-fluid">
      <ul id="imageGallery">
        <li>
          <a href="https://i.imgur.com/BTRfA0D.png">
            <img src="https://i.imgur.com/BTRfA0D.png" alt="Boat by Griffin Moore">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/gSkOt7T.png">
            <img src="https://i.imgur.com/gSkOt7T.png" alt="Chuck by Mat Helme">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/B1JqazJ.png">
            <img src="https://i.imgur.com/B1JqazJ.png" alt="Wanted: Copy McRepeatsalot by Chris Michel">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/1e9rswE.png">
            <img src="https://i.imgur.com/1e9rswE.png" alt="Education by Chris Michel">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/NShslAl.png">
            <img src="https://i.imgur.com/NShslAl.png" alt="Illustrator Foundations by Matthew Spiel">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/6IfZsza.png">
            <img src="https://i.imgur.com/6IfZsza.png" alt="Library by Tyson Rosage">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/sfdvbFt.png">
            <img src="https://i.imgur.com/sfdvbFt.png" alt="Referal Machine by Matthew Spiel">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/f6cZZU9.png">
            <img src="https://i.imgur.com/f6cZZU9.png" alt="Sebastian by Mat Helme">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/WEbvIDZ.png">
            <img src="https://i.imgur.com/WEbvIDZ.png" alt="Skill Polish by Chris Michel">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/7roabAR.png">
            <img src="https://i.imgur.com/7roabAR.png" alt="Space Juice by Mat Helme">
          </a>
        </li>
        <li>
          <a href="https://i.imgur.com/HlNF7oY.jpg">
            <img src="https://i.imgur.com/HlNF7oY.jpg" alt="Treehouse Shop by Eric Smith">
          </a>
        </li>
      </ul>
    </div>
!

CSS 

              
                body {
	color: white;
	font-family: sans-serif;
	background: #384047;
}

h1 {
	text-align: center;
	margin: 30px auto;
	font-weight: bold;
}

img {
	width: 120px;
	border: 10px solid white;
	margin: 10px;
}

ul {
	list-style: none;
}

li {
	display: inline-block;
}

.container-fluid {
	max-width: 800px;
	text-align: center;
}

#overlay {
	position: absolute;
	width: 100%;
	height: 100%;
	background: rgba(0, 0, 0, .7);
	top: 0;
	left: 0;
	display: none;
	text-align: center;
}

#overlay img {
	margin-top: 10%;
	width: 500px;
}
!

JS 

              
                //store html elements into variables
var $overlay = $('<div id="overlay"></div>');
var $image = $("<img>");
var $caption = $("<p></p>");

//add the elements onto each other
$overlay.append($image);
$overlay.append($caption);
$("body").append($overlay);

//click event
$("#imageGallery a").click(function(event) {
	//prevent the default functionality of proceeding to a dead link
	event.preventDefault();
	//store the image location into a variable
	var imageLocation = $(this).attr("href");
	//set the image's attribute src to the image location
	$image.attr("src", imageLocation);
	//store the image's alt attribute text into a variable
	var captionText = $(this).children().attr("alt");
	//add the text into paragraph tags 
	$caption.text(captionText);
	//show the overlay
	$overlay.show();
});

//click event
$overlay.click(function() {
	//hide the overlay when clicked on
	$overlay.hide();
});
!
999px

Console