Bootstrap utilizes Sass for a modular and customizable architecture. Import only the components you need, enable global options like gradients and shadows, and write your own CSS with our variables, maps, functions, and mixins.

Get started with Bootstrap, the world’s most popular framework for building responsive, mobile-first sites, with jsDelivr and a template starter page.

Get started by including Bootstrap’s production-ready CSS and JavaScript via CDN without the need for any build steps. See it in practice with this Bootstrap CodePen demo.

2025年6月17日 · Bootstrap v5.3.7 was just released with some follow-up fixes from our migration to Astro, plus a handful of small fixes. We expect to have another patch release shortly due to at least one recent regression, so stay tuned for that.

Get started with Bootstrap, the world’s most popular framework for building responsive, mobile-first sites, with jsDelivr and a template starter page.

Download Bootstrap to get the compiled CSS and JavaScript, source code, or include it with your favorite package managers like npm, RubyGems, and more.

Download Bootstrap to get the compiled CSS and JavaScript, source code, or include it with your favorite package managers like npm, RubyGems, and more.

Install Bootstrap Icons —including SVGs, icon sprite, and icon fonts—with npm or Composer. Then, choose how you’d like to include the icons with the usage instructions.

Take Bootstrap to the next level with premium themes from the official Bootstrap Themes marketplace. They’re built as their own extended frameworks, rich with new components and plugins, documentation, and powerful build tools.

Bootstrap, a sleek, intuitive, and powerful mobile first front-end framework for faster and easier web development.