Style Sheets

With CLion, 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 Control+Alt+S to open the IDE 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

CLion 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, CLion first suggests classes and ids from the style tag and files linked with link tags. If no matching results are found, CLion 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 Control+Space twice.

Project-wide completion for Style Sheet symbols in HTML

Complete Style Sheet classes from external libraries

With CLion, 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. CLion 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

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

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 Control+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, CLion 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 information about its compatibility with various browsers.

Style sheets quick documentation: compatible browsers are listed

If the property is available in all versions of browsers, CLion does not show any information about its compatibility.

Otherwise, the Documentation popup also lists the browsers and their versions that support the property.

For selectors, CLion also shows their specificity.

Documentation look-up: specificity fpr selectors

View documentation for a property

Position the caret at the property and press Control+Q or select View | Quick Documentation Lookup from the main menu.
When you hover over a property, CLion 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 (Control+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 Control+Q, click the link at the bottom.
Press Shift+F1 or select View | External Documentation from the main menu.

Formatting

With CLion 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 (Control+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.
In the CSS, SCSS, and Less context, CLion 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 Control+Alt+L.
To reformat a file or a folder, select it in the Project tool window and press Control+Alt+L.

See Reformat and rearrange code for more details.

Alternatively, you can use the Prettier (Command Alt Shift P). For more information, refer to Prettier.

Refactoring

With CLion, 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 Control+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 CLion, 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.

CLion 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, CLion will suggest creating it.
By default, CLion 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 (Control+Alt+S), go to Editor | Inspections.
Expand the CSS node and select the Browser compatibility for properties. In the Options area, select the browsers you want to target and the minimum versions for them.

Changing color values

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

Choose colors

Open the desired Style Sheet for editing.
Type color:, and then press Control+Space.
Select the desired color value from the suggestion list or choose color... to pick a custom one.

Change colors

Open the desired Style Sheet for editing, and locate the color property that you want to change.
Click the color icon in the gutter.
Alternatively, if the icons are not shown, press Alt+Enter and select Change color from the list. See To show color icons in the gutter below.
In the Choose color dialog that opens, pick the desired new color and click Choose.

Preview the code of colors

CLion marks each color property with a gutter icon of the corresponding color. When you hover over a color icon, CLion displays a popup that shows the color preview and its hexadecimal code.
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

Show color icons in the gutter

By default, CLion displays color icons in the gutter. If they are hidden, you can return them at any time.

In the Settings dialog (Control+Alt+S), go to Editor | General | Gutter Icons. The Gutter Icons page opens.
In the Common area, select the Color preview checkbox.

Viewing the styles applied to a tag

In HTML and XHTML files, CLion 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.
CLion 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, CLion 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 (Control+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.

Last modified: 11 October 2023