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HTML

              
                <div class="center-align valign-wrapper" style="height: 100%; justify-content: center">
  <div>
    <h1>CKEditor 5 Baloon with Materialize.css</h1>
    <button data-target="modal1" class="btn modal-trigger ">Click to open modal</button>
  </div>
</div>

  <!-- Modal Structure -->
  <div id="modal1" class="modal">
    <div class="modal-content">
			
      <div id="editor">
        <p>This is sample content of <a href="https://ckeditor.com">CKEditor 5 Balloon Build</a>.</p>
        <ul>
          <li>List item 1</li>
          <li>List item 2</li>
        </ul>
				<p>Now, <strong>make some text selection</strong>! :)</p>
			</div>
			
			<div class="modal-footer">
      	<a href="#!" class="modal-close waves-effect waves-green btn-flat">Close</a>
    	</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 );
}

/* We need to overwrite default Materialize strong appearance.
   See: https://github.com/Dogfalo/materialize/blob/v1-dev/sass/components/_typography.scss#L41.
 */

.ck.ck-content strong {
  font-weight: bold;
}

/* We need to overwrite default Materialize list appearance. 
 * See: https://github.com/ckeditor/ckeditor5/issues/1672. 
 */
.ck.ck-content ul,
.ck.ck-content ul li{
  list-style-type: inherit;
}

.ck.ck-content ul {
  /* Default user agent stylesheet. */
  padding-left: 40px;
}

 /* We need to overwrite default Materialize input appearance. 
  * See: https://github.com/Dogfalo/materialize/blob/v1-dev/sass/components/forms/_input-fields.scss#L10-L40 
  */
.ck input.ck-input.ck-input-text {
  box-shadow: var(--ck-inner-shadow),0 0;
  background: var(--ck-color-input-background);
  border: 1px solid var(--ck-color-input-border);
  padding: var(--ck-spacing-extra-tiny) var(--ck-spacing-medium);
  transition-property: box-shadow,border;
  transition: .2s ease-in-out;
  
  height: inherit;
  width: inherit;
  font-size: inherit;
  margin: 0;
  box-sizing: border-box;
}

.ck input.ck-input.ck-input-text:focus {
  border: var(--ck-focus-ring);
  box-shadow: var(--ck-focus-outer-shadow),var(--ck-inner-shadow);
}

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

h1 { font-size: 36px; color: #fff; }
              
            
!

JS

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

// If you need classic editor instead of balloon, use this code:
// ClassicEditor
// 	.create( document.querySelector( '#editor' ) )
// 	.catch( error => {
// 		console.error( error );
// 	} );

document.addEventListener( 'DOMContentLoaded', () => {
	const modal = document.querySelector( '.modal' );
	
	// Make sure the modal does not steal the input focus (e.g. when editing a link).
	// https://github.com/ckeditor/ckeditor5/issues/1147
	M.Modal.init( modal, { dismissible: false } );
} );
              
            
!
999px

Console