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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.

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Insecure Resource

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CSS

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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.

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JavaScript

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

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Babel includes JSX processing.

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HTML 

              
                <div class="row h-100 align-items-center">
	<div class="col text-center">
		<h1><svg width="68" height="65" viewBox="0 0 68 65" xmlns="http://www.w3.org/2000/svg"><path d="M45.586 9.267a12.604 12.604 0 0 0-1.329 5.65c0 7.032 5.744 12.733 12.83 12.733l.273-.003V45.48a5.987 5.987 0 0 1-3.019 5.19L31.65 63.673a6.076 6.076 0 0 1-6.037 0L2.922 50.67a5.984 5.984 0 0 1-3.02-5.19V19.474c0-2.14 1.15-4.12 3.02-5.19L25.611 1.28a6.076 6.076 0 0 1 6.037 0l13.937 7.986zm-29.44 11.89c-.834 0-1.51.67-1.51 1.498v.715c0 .828.676 1.498 1.51 1.498h25.49c.832 0 1.51-.67 1.51-1.498v-.715c0-.827-.678-1.498-1.51-1.498h-25.49zm0 18.454c-.834 0-1.51.67-1.51 1.498v.715c0 .828.676 1.498 1.51 1.498h25.49c.832 0 1.51-.67 1.51-1.498v-.715c0-.827-.678-1.498-1.51-1.498h-25.49zm0-9.227c-.834 0-1.51.67-1.51 1.498v.715c0 .828.676 1.498 1.51 1.498h18.48c.832 0 1.508-.67 1.508-1.498v-.715c0-.827-.676-1.498-1.51-1.498H16.146zm41.191-5.232c-5.835 0-10.565-4.695-10.565-10.486 0-5.792 4.73-10.487 10.565-10.487 5.835 0 10.565 4.696 10.565 10.488 0 5.79-4.73 10.486-10.565 10.486v-.001zm3.422-8.68c0-.467-.084-.875-.25-1.225a2.547 2.547 0 0 0-.687-.88 2.888 2.888 0 0 0-1.026-.531 4.418 4.418 0 0 0-1.259-.175c-.134 0-.283.006-.447.018-.15.01-.3.034-.446.07l.075-1.4h3.587v-1.8h-5.462l-.214 5.06c.32-.116.682-.21 1.09-.28.405-.071.77-.107 1.087-.107.218 0 .437.02.655.063.218.04.413.114.585.218s.313.244.422.419c.11.175.163.39.163.65 0 .424-.132.745-.396.96a1.434 1.434 0 0 1-.938.326c-.352 0-.656-.1-.912-.3-.256-.2-.43-.453-.523-.762l-1.925.588c.1.35.258.664.472.943.214.279.47.514.767.706.298.19.63.339.995.443.365.104.75.156 1.151.156.437 0 .86-.064 1.272-.193.41-.13.778-.323 1.1-.581a2.8 2.8 0 0 0 .775-.981c.193-.396.29-.864.29-1.405z" fill="#FFF" fill-rule="evenodd"/></svg>  CKEditor 5 Balloon with Bootstrap 4</h1>
		<a href="#" class="btn btn-lg btn-dark" data-toggle="modal" data-target="#basicModal">Click to open Modal</a>
	</div>

	<div class="modal fade" id="basicModal" tabindex="-1" role="dialog" aria-labelledby="basicModal" aria-hidden="true">
		<div class="modal-dialog modal-lg">
			<div class="modal-content">
				<div class="modal-header">
					<button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
				</div>
				<div class="modal-body">
					<div id="editor">
						<p>This is sample content of <a href="https://ckeditor.com">CKEditor 5 Balloon Build</a>.</p>

						<p>Now, <strong>make some text selection</strong>! :)</p>

					</div>
				</div>
			</div>
		</div>
	</div>
!

CSS 

              
                body {
	/* We need to assaign this CSS Custom property to the body instead of :root, because of CSS Specificity and codepen stylesheet placement before loaded CKE5 content. */
	--ck-z-default: 100;
	--ck-z-modal: calc( var(--ck-z-default) + 999 );
}

/* Visual improvements. */
body, html { margin: 0; padding: 0; width: 100vw; height: 100vh; overflow: hidden; background: #56b968;}

h1 { color: #fff; }
h1 svg { position: relative; top: 20px; margin-right: 10px; }
!

JS 

              
                BalloonEditor
	.create( document.querySelector( '#editor' ) )
	.catch( error => {
		console.error( error );
	} );

// Make sure the modal does not steal the input focus (e.g. when editing a link).
// https://github.com/ckeditor/ckeditor5/issues/1147
$( '#basicModal' ).modal( {
	focus: false,
	
	// Do not show modal when innitialized.
	show: false
} );
!
999px

Console