# Styles

The style feature lets you apply pre-configured styles to elements in your content. It works by adding one or more CSS classes to an element to change its appearance or add semantic information.

<a id="demo">

## Demo

Use the demo below to test the styles feature. Select a passage or a header and try applying various styles.

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This demo presents a limited set of features. Visit the [feature-rich editor example](../examples/builds-custom/full-featured-editor.md) to see more in action.

Configuration of the above demo

> **Note**
>
> See the [Configuration](#configuration) section to learn more about the configuration format.

The editor configuration:

```js
// ...
style: {
	definitions: [
		{
			name: 'Article category',
			element: 'h3',
			classes: [ 'category' ]
		},
		{
			name: 'Title',
			element: 'h2',
			classes: [ 'document-title' ]
		},
		{
			name: 'Subtitle',
			element: 'h3',
			classes: [ 'document-subtitle' ]
		},
		{
			name: 'Info box',
			element: 'p',
			classes: [ 'info-box' ]
		},
		{
			name: 'Side quote',
			element: 'blockquote',
			classes: [ 'side-quote' ]
		},
		{
			name: 'Marker',
			element: 'span',
			classes: [ 'marker' ]
		},
		{
			name: 'Spoiler',
			element: 'span',
			classes: [ 'spoiler' ]
		},
		{
			name: 'Code (dark)',
			element: 'pre',
			classes: [ 'fancy-code', 'fancy-code-dark' ]
		},
		{
			name: 'Code (bright)',
			element: 'pre',
			classes: [ 'fancy-code', 'fancy-code-bright' ]
		}
	]
},
// ...
```

The style sheet:

```css
@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=PT+Serif:ital,wght@0,400;0,700;1,400&display=swap');

.ck.ck-content {
	font-family: 'PT Serif', serif;
	font-size: 16px;
	line-height: 1.6;
	padding: 2em;
}

.ck-content .ck-horizontal-line {
	margin-bottom: 1em;
}

.ck.ck-content hr {
	width: 100px;
	border-top: 1px solid #aaa;
	height: 1px;
	margin: 1em auto;
}

.ck.ck-content h3.category {
	font-family: 'Bebas Neue';
	font-size: 20px;
	font-weight: bold;
	color: #d1d1d1;
	letter-spacing: 10px;
	margin: 0;
	padding: 0;
}

.ck.ck-content h2.document-title {
	font-family: 'Bebas Neue';
	font-size: 50px;
	font-weight: bold;
	margin: 0;
	padding: 0;
	border: 0;
}

.ck.ck-content h3.document-subtitle {
	font-size: 20px;
	color: #e91e63;
	margin: 0 0 1em;
	font-weight: normal;
	padding: 0;
}

.ck.ck-content p.info-box {
	--background-size: 30px;
	--background-color: #e91e63;
	padding: 1.2em 2em;
	border: 1px solid var(--background-color);
	background: linear-gradient(135deg, var(--background-color) 0%, var(--background-color) var(--background-size), transparent var(--background-size)), linear-gradient(135deg, transparent calc(100% - var(--background-size)), var(--background-color) calc(100% - var(--background-size)), var(--background-color));
	border-radius: 10px;
	margin: 1.5em 2em;
	box-shadow: 5px 5px 0 #ffe6ef;
}

.ck.ck-content blockquote.side-quote {
	font-family: 'Bebas Neue';
	font-style: normal;
	float: right;
	width: 35%;
	position: relative;
	border: 0;
	overflow: visible;
	z-index: 1;
	margin-left: 1em;
}

.ck.ck-content blockquote.side-quote::before {
	content: "“";
	position: absolute;
	top: -37px;
	left: -10px;
	display: block;
	font-size: 200px;
	color: #e7e7e7;
	z-index: -1;
	line-height: 1;
}

.ck.ck-content blockquote.side-quote p {
	font-size: 2em;
	line-height: 1;
}

.ck.ck-content blockquote.side-quote p:last-child:not(:first-child) {
	font-size: 1.3em;
	text-align: right;
	color: #555;
}

.ck.ck-content span.marker {
	background: yellow;
}

.ck.ck-content span.spoiler {
	background: #000;
	color: #000;
}

.ck.ck-content span.spoiler:hover {
	background: #000;
	color: #fff;
}

.ck.ck-content pre.fancy-code {
	border: 0;
	margin-left: 2em;
	margin-right: 2em;
	border-radius: 10px;
}

.ck.ck-content pre.fancy-code::before {
	content: "";
	display: block;
	height: 13px;
	background: url(data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA1NCAxMyI+CiAgPGNpcmNsZSBjeD0iNi41IiBjeT0iNi41IiByPSI2LjUiIGZpbGw9IiNGMzZCNUMiLz4KICA8Y2lyY2xlIGN4PSIyNi41IiBjeT0iNi41IiByPSI2LjUiIGZpbGw9IiNGOUJFNEQiLz4KICA8Y2lyY2xlIGN4PSI0Ny41IiBjeT0iNi41IiByPSI2LjUiIGZpbGw9IiM1NkM0NTMiLz4KPC9zdmc+Cg==);
	margin-bottom: 8px;
	background-repeat: no-repeat;
}

.ck.ck-content pre.fancy-code-dark {
	background: #272822;
	color: #fff;
	box-shadow: 5px 5px 0 #0000001f;
}

.ck.ck-content pre.fancy-code-bright {
	background: #dddfe0;
	color: #000;
	box-shadow: 5px 5px 0 #b3b3b3;
}
```

<a id="installation">

## Installation

After [installing the editor](../getting-started/installation/cloud/quick-start.md), add the feature to your plugin list and toolbar configuration:

**NPM**

```js
import { ClassicEditor, Style, GeneralHtmlSupport } from 'ckeditor5';

ClassicEditor
	.create( {
		licenseKey: '<YOUR_LICENSE_KEY>', // Or 'GPL'.
		plugins: [ Style, GeneralHtmlSupport, /* ... */ ],
		toolbar: [ 'style', /* ... */ ],
		style: {
			// Configuration.
		},
		htmlSupport: {
			// Configuration.
		}
	} )
	.then( /* ... */ )
	.catch( /* ... */ );
```

**CDN**

```js
const { ClassicEditor, Style, GeneralHtmlSupport } = CKEDITOR;

ClassicEditor
	.create( {
		licenseKey: '<YOUR_LICENSE_KEY>',
		plugins: [ Style, GeneralHtmlSupport, /* ... */ ],
		toolbar: [ 'style', /* ... */ ],
		style: {
			// Configuration.
		},
		htmlSupport: {
			// Configuration.
		}
	} )
	.then( /* ... */ )
	.catch( /* ... */ );
```

> **Important**
>
> The style feature requires the [General HTML Support](html/general-html-support.md) feature to work properly.

<a id="configuration">

## Configuration

Configuring the styles feature takes two steps. First, you need to define the styles in the configuration file, for example:

```js
ClassicEditor
	.create( {
		// ... Other configuration options ...
		style: {
			definitions: [
				{
					name: 'Article category',
					element: 'h3',
					classes: [ 'category' ]
				},
				{
					name: 'Info box',
					element: 'p',
					classes: [ 'info-box' ]
				},
			]
		}
	} )
	.then( /* ... */ )
	.catch( /* ... */ );
```

Then, define the corresponding CSS styles for the document:

```css
.ck.ck-content h3.category {
	font-family: 'Bebas Neue';
	font-size: 20px;
	font-weight: bold;
	color: #d1d1d1;
	letter-spacing: 10px;
	margin: 0;
	padding: 0;
}

.ck.ck-content p.info-box {
	padding: 1.2em 2em;
	border: 1px solid #e91e63;
	border-left: 10px solid #e91e63;
	border-radius: 5px;
	margin: 1.5em;
}
```

The editor will automatically distinguish text and block styles and group them in the dropdown.

<a id="known-issues">

## Known issues

At present, the style feature may clash with other features that bring in similar content (like headings). Problems with overlapping styles applied to the same element may also occur.

<a id="related-features">

## Related features

Check out also these CKEditor 5 features to gain better control over your content style and format:

* [Basic text styles](basic-styles.md) – Apply the most frequently used formatting such as bold, italic, underline, etc.
* [Font styles](font.md) – Control the font [family](font.md#configuring-the-font-family-feature), [size](font.md#configuring-the-font-size-feature), [text or background color](font.md#configuring-the-font-color-and-font-background-color-features).
* [Headings](headings.md) – Divide your content into sections.
* [Format painter](format-painter.md) – Easily copy text formatting and apply it in a different place in the edited document.
* [Remove format](remove-format.md) – Easily clean basic text formatting.
* [General HTML support](html/general-html-support.md) – Enable additional HTML, such as `<style>` and `<classes>` attributes.

<a id="common-api">

## Common API

The [Style](../api/module_style_style-Style.md) plugin registers:

* The `'style'` command implemented by [`StyleCommand`](../api/module_style_stylecommand-StyleCommand.md).
* The `'style'` UI dropdown.

You can execute the command using the [`editor.execute()`](../api/module_core_editor_editor-Editor.md#function-execute) method:

```js
// Applies the style to the selected content.
// Executing the command again will remove the style from the selected content.
editor.execute( 'style', { styleName: 'Article category' } );
```

> **Note**
>
> We recommend using the official [CKEditor 5 inspector](../framework/development-tools/inspector.md) for development and debugging. It will give you tons of useful information about the state of the editor such as internal data structures, selection, commands, and many more.

<a id="contribute">

## Contribute

The source code of the feature is available on GitHub at <https://github.com/ckeditor/ckeditor5/tree/master/packages/ckeditor5-style>.

---

Full index of the CKEditor 5 documentation: [llms.txt](../../llms.txt)