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# Bootstrap

Build responsive, mobile-first projects on the web with the world's most popular front-end component library.

Bootstrap is an open source toolkit for developing with HTML, CSS, and JS. Quickly prototype your ideas or build your entire app with our Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful plugins built on jQuery.

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Currently v4.0.0-beta

### Installation

Include Bootstrap's source Sass and JavaScript files via Bower, Composer, Meteor, or npm. Package managed installs don't include documentation, but do include our build system and readme.

    npm install bootstrap@4.0.0-beta

    gem install bootstrap -v 4.0.0.alpha6

    bower install bootstrap#v4.0.0-beta

Read installation docs

### Bootstrap CDN

When you only need to include Bootstrap's compiled CSS or JS, you can use the Bootstrap CDN.

Coming shortly!

Explore the docs

### Official Themes

Take Bootstrap 4 to the next level with official premium themes—toolkits built on Bootstrap with new components and plugins, docs, and build tools.

Browse themes