# Style Sheets

> For the complete documentation index, see [llms.txt](https://www.jetbrains.com/help/idea/llms.txt).

With IntelliJ IDEA, you can write style definitions in [CSS](https://www.w3.org/Style/CSS/) as well as in various languages that compile into it, such as [Sass](https://sass-lang.com/), [Less](http://lesscss.org/), [SCSS](https://sass-lang.com/documentation/file.SASS_REFERENCE.html#syntax), or [Stylus](http://stylus-lang.com/).

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