Style Sheets

With IntelliJ IDEA, you can write style definitions in CSS as well as in various languages that compile into it, such as Sass, Less, SCSS, or Stylus.

You can also look up documentation for Style Sheets, create and move rulesets, introduce variables, and more.

Before you start

Make sure the CSS plugin is enabled in the settings. Press Ctrl+Alt+S to open settings and then select Plugins. Click the Installed tab. In the search field, type CSS. For more information about plugins, refer to Managing plugins.

Code completion

IntelliJ IDEA provides code completion for properties, their values, selectors, variables, and mixins.

Complete Style Sheet classes

Completion for CSS, SCSS, Less, and Sass classes and ids is available in HTML files, in various types of templates (for example, in Angular or Vue.js), as well as in JSX code.

In HTML files, IntelliJ IDEA first suggests classes and ids from the style tag and files linked with link tags. If no matching results are found, IntelliJ IDEA also suggests symbols defined in all stylesheet files in the project. To see all classes and ids defined in the project straight away, before you start typing, press Ctrl+Space twice.

Project-wide completion for Style Sheet symbols in HTML

Complete Style Sheet classes from external libraries

With IntelliJ IDEA, you can also get completion for class names from Twitter Bootstrap or other CSS libraries that are linked from a CDN in an HTML file without adding these libraries to your project dependencies.

Enabling completion for an external CSS library

Open the HTML file with a CDN link to an external CSS library. IntelliJ IDEA highlights the link.
To enable completion for the library, press Alt+Enter on the link and select Download library from the list. Alternatively, hover over the link and click Download library.

The library is added to the list of JavaScript libraries on the Settings | Languages and Frameworks | JavaScript | Libraries page. For more information, refer to Configuring a library added via a CDN link.

Complete Sass and SCSS selectors

IntelliJ IDEA also provides completion for Sass and SCSS selectors - including nested selectors and selectors created with an ampersand (&).

Cloud Completion and Full Line completion in Style Sheets

IntelliJ IDEA provides Cloud Completion and Full Line completion in CSS, Less, Sass/SCSS, and PostCSS code.

The Full Line code completion feature uses a locally run deep learning model to suggest entire lines of code. It is available in IntelliJ IDEA Ultimate out of the box and does not require an additional license.

Enable Full Line code completion in Style Sheets

Press Ctrl+Alt+S to open settings and select Editor | General | Inline Completion.
Select the Enable local Full Line completion suggestions checkbox and make sure the CSS-like checkbox is selected.

Cloud completion powered by AI Assistant can autocomplete single lines, blocks of code, and even entire functions in real time based on the project context.

Cloud Completion suggests syntactically acceptable solutions taking the context into account and runs various code inspections in advance to reject the variants that result in errors.

Enable Cloud Completion

Install and enable the AI Assistant plugin.
Press Ctrl+Alt+S to open settings and select Editor | General | Inline Completion.
Select the Enable cloud completion suggestions checkbox and make sure the HTML checkbox is selected.

Search and navigation

To find usages of a Style Sheet symbol, place the caret at it and press Alt+F7. Learn more from Search for usages in a project.
To jump from a usage of a Style Sheet symbol to its definition, press Ctrl+B. Navigation to definition is available for classes, ids, selectors – including nested selectors and selectors with an ampersand & - as well as for variables and mixins.
Learn more from Go to declaration.

Documentation look-up

For properties and pseudo-elements, IntelliJ IDEA can show you a summary from the corresponding MDN article. This summary is displayed in the Documentation popup which shows a brief description of the property and its values, as well as its Web platform Baseline status.

Style sheets quick documentation: Baseline, widely available

Style sheets quick documentation: Baseline, newly available

Style sheets quick documentation: Baseline, limited availability

For selectors, IntelliJ IDEA also shows their specificity.

Documentation look-up: specificity fpr selectors

View documentation for a property

Position the caret at the property and press Ctrl+Q or select View | Quick Documentation Lookup from the main menu.
When you hover over a property, IntelliJ IDEA immediately displays the reference for it in the Documentation popup.
You can turn off this behavior or configure the popup to appear faster or slower, refer to Configuring the behavior of Documentation popup below.

Configure the behavior of Documentation popup

To turn off showing documentation automatically when you hover over code symbols, Click in the popup and disable the Show on Mouse Move option.
To have the Documentation popup shown faster or slower, open the Settings dialog (Ctrl+Alt+S) , go to Editor | General | Code Completion, then select the Show the documentation popup checkbox and specify the delay time.

Open the MDN documentation in the browser

In the Documentation popup Ctrl+Q, click the link at the bottom.
Press Shift+F1 or select View | External Documentation from the main menu.

Formatting

With the IntelliJ IDEA built-in formatter, you can reformat fragments of Style Sheet code as well as entire files and folders to meet the language-specific code style requirements. The formatter also wakes up automatically when you generate or refactor your code.

To configure formatting for a Style Sheet language, open the Settings dialog (Ctrl+Alt+S) , go to Editor | Code Style | Style Sheets | <your Style Sheet language>, and configure the language-specific settings for tabs and indents, spaces, wrapping and braces, hard and soft margins, and so on.
As you change the settings, the Preview area shows how the changes affect formatting.
In the CSS, SCSS, and Less context, IntelliJ IDEA by default uses double quotes for generated string literals in import statements and URLs. To use single quotes, open the Other tab, and select Single from the Quote marks list.
To apply the chosen style to the entire file after reformatting, select the Enforce on format checkbox below the list.
Currently changing the configuration for quotation marks does not affect injected style sheets and CSS code inside the <style> tags.
To reformat a code fragment, select it in the editor and press Ctrl+Alt+L.
To reformat a file or a folder, select it in the Project tool window Alt+1 and press Ctrl+Alt+L. See Reformat and rearrange code for more details.
Alternatively, you can use Prettier (Ctrl+Alt+Shift+P).

Refactoring

With IntelliJ IDEA, you can convert expressions in Style Sheets into variables and introduce these variables using the var(--var-name) syntax in .css files or the $ syntax in .scss and .sass files.

Introduce variables

In the editor, place the caret at the expression to convert into a variable and press Ctrl+Alt+V or select Refactor | Introduce | Introduce Variable from the context menu or from the main menu.
If more than one occurrence of the selected expression is found, select Replace this occurrence only or Replace all occurrences from the Multiple occurrences found list.
For .scss, and .sass, select the global or local scope for the variable.
In the field with red borders, accept the suggested variable name or specify a custom name. Press Enter when ready.

With IntelliJ IDEA, you can create new rulesets from existing declarations in CSS, SCSS, Sass, or Less files and even move entire rulesets between files using refactoring and intention actions.

Introduce rulesets

Select the declarations to introduce. If you need only one declaration, just place the caret inside it.
Press Alt+Enter and select Introduce ruleset from the list.

IntelliJ IDEA creates a new ruleset with the same selector and moves the selected declarations to it. If the selection contains comments, nested selectors, and so on, they are also moved to the new ruleset.

Move rulesets to other files

Place the caret anywhere in the ruleset to move and press F6.
In the dialog that opens, specify the file to move the ruleset to. If the specified file does not exist, IntelliJ IDEA will suggest creating it.
By default, IntelliJ IDEA automatically opens the file where the ruleset is moved. To change this behavior, clear the Open in editor checkbox.

Common refactorings, such as Copy, Move, or Rename, are also available.

Checking compatibility with browsers

Besides looking up in the documentation popup, you can check Style Sheet properties for compatibility with specific browsers on the fly. This inspection is based on the MDN Browser Compatibility Data and shows you a warning every time a property is not supported in one of the targeted browsers.

Turn on compatibility check

In the Settings dialog (Ctrl+Alt+S) , go to Editor | Inspections.
Expand the CSS node and select the Property is incompatible with selected browsers. In the Options area, select the browsers you want to target and the minimum versions for them.
In the Options area, select the browsers to check the availability of properties against. Specify the target versions of the selected browsers.

Managing colors

With IntelliJ IDEA, you can easily change color values in Style Sheets without typing hexadecimal codes.

To specify a color, place the caret at a color property, press Ctrl+Space, and then select the desired color value or choose color... to pick a custom one.
To use a code instead of a human-readable color name, press Alt+Enter and select Convert color to <color code system> from the list, where <color code system> is HEX, HSL, HWB, or RGB
To change a color, click a color icon in the gutter and pick the desired color in the popup.
Alternatively, place the caret at a color property, press Alt+Enter, select Change color from the list, and then pick the desired color from in the popup.
By default, IntelliJ IDEA displays color preview as icons in the gutter. To show color preview in the background, open the Settings dialog (Ctrl+Alt+S) , go to Editor | Appearance and select the Show CSS color preview as background checkbox.
To restore the color preview gutter icons, open the Settings dialog (Ctrl+Alt+S) , go to Editor | General | Gutter Icons and select the Color preview checkbox in the Common area.

Viewing the styles applied to a tag

In HTML, XHTML, JSP and JSPX files, IntelliJ IDEA can show you all the styles applied to an arbitrary tag.

Viewing the styles applied to the tag <body>

From the context menu of a tag, select Show Applied Styles for Tag.
IntelliJ IDEA opens the CSS Styles tool window with two panes, the left-hand pane shows the styles for the tag and the right-hand pane shows their definitions. For each tag, IntelliJ IDEA opens a separate tab.
From the tool window, you can navigate to tags and definitions of properties in your source code.
- To jump to the tag, click on the toolbar of the left-hand pane.
- To jump to the definition of a property, select it in the left-hand pane and click on the toolbar of the right-hand pane.

Configuring syntax highlighting

You can configure CSS-aware syntax highlighting according to your preferences and habits.

In the Settings dialog (Ctrl+Alt+S) , go to Editor | Color Scheme | CSS.
Select the color scheme, accept the highlighting settings inherited from the defaults or customize them as described in Colors and fonts.

27 August 2025