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# Less.js > The dynamic stylesheet language. [lesscss.org](http://lesscss.org) Less extends CSS with variables, mixins, functions, nesting, and more — then compiles to standard CSS. Write cleaner stylesheets with less code. ```less @primary: #4a90d9; .button { color: @primary; &:hover { color: darken(@primary, 10%); } } ``` ## Install ```sh npm install less ``` ## Usage ### Node.js ```js import less from 'less'; const output = await less.render('.class { width: (1 + 1) }'); console.log(output.css); ``` ### Command Line ```sh npx lessc styles.less styles.css ``` ### Browser ```html ``` ## Why Less? - **Variables** — define reusable values once - **Mixins** — reuse groups of declarations across rulesets - **Nesting** — mirror HTML structure in your stylesheets - **Functions** — transform colors, manipulate strings, do math - **Imports** — split stylesheets into manageable pieces - **Extend** — reduce output size by combining selectors ## Documentation Full documentation, usage guides, and configuration options at **[lesscss.org](http://lesscss.org)**. ## Contributing Less.js is open source. [Report bugs](https://github.com/less/less.js/issues), submit pull requests, or help improve the [documentation](https://github.com/less/less-docs). See [CONTRIBUTING.md](https://github.com/less/less.js/blob/master/CONTRIBUTING.md) for development setup. ## License Copyright (c) 2009-2025 [Alexis Sellier](http://cloudhead.io) & The Core Less Team Licensed under the [Apache License](https://github.com/less/less.js/blob/master/LICENSE).

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