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Powerful, extensible, and feature-packed frontend toolkit. Build and customize with Sass, utilize prebuilt grid system and components, and bring projects to life with powerful JavaScript plugins.

Jump right into building with Bootstrap—use the CDN, install it via package manager, or download the source code.

Install Bootstrap’s source Sass and JavaScript files via npm, RubyGems, Composer, or Meteor. Package-managed installs don’t include documentation or our full build scripts. You can also use any demo from our Examples repo to quickly jumpstart Bootstrap projects.

When you only need to include Bootstrap’s compiled CSS or JS, you can use jsDelivr. See it in action with our simple quick start, or browse the examples to jumpstart your next project. You can also choose to include Popper and our JS separately.