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twbs/bootstrap

🔥 Hot★ 174,250MDXAudience · developerComplexity · 2/5ActiveLicenseSetup · easy

TLDR

A front-end framework providing pre-built HTML, CSS, and JavaScript components (buttons, forms, grids, modals) that work across all screen sizes, so you can build responsive websites faster without writing CSS from scratch.

Mindmap

mindmap
  root((Bootstrap))
    What it does
      Pre-built components
      Responsive design
      Mobile-first approach
    Tech stack
      HTML
      CSS and Sass
      JavaScript
      Popper library
    How to use
      Download compiled files
      Customize with Sass
      Install via npm
      ESM builds
    Use cases
      Build websites fast
      Consistent UI design
      Extend with tokens

Things people build with this

USE CASE 1

Build a responsive website with pre-styled buttons, forms, and navigation without writing custom CSS.

USE CASE 2

Create a mobile-first web app that automatically adapts from phone screens to desktop displays.

USE CASE 3

Customize Bootstrap's colors and spacing by modifying Sass variables instead of editing CSS files.

USE CASE 4

Add interactive components like modals, dropdowns, and tooltips with built-in JavaScript functionality.

Tech stack

HTMLCSSSass/SCSSJavaScriptPopperAstroMDX

Getting it running

Difficulty · easy Time to first run · 5min
Use freely for any purpose, including commercial use, as long as you keep the copyright notice and license text.

In plain English

Bootstrap is a front-end framework for building responsive, mobile-first websites and web apps. The README describes it as a sleek, intuitive, and powerful framework for faster and easier web development. Concretely, it gives you a ready-made set of HTML, CSS, and JavaScript building blocks, buttons, forms, navigation bars, grids, modals, and so on, that look polished out of the box and adapt to different screen sizes from phones up to desktops. It works by shipping compiled CSS and JavaScript files you drop into your web project, plus the original Sass/SCSS source if you want to customize colors, spacing, breakpoints, and so on through configuration variables. The downloaded package includes a base bootstrap.css plus narrower bundles like a grid-only build, a CSS reset called bootstrap-reboot, and utility classes, each available in normal, minified, and right-to-left variants, with source maps for browser dev tools. The bundled JavaScript files include Popper for positioning floating elements like tooltips and dropdowns, and there's also an ESM build for modern bundlers. You'd use Bootstrap when you want a usable, consistent UI across devices without writing all the CSS yourself, or when you need a baseline you can extend with your own design tokens through Sass. Installation options are flexible: download the latest release, clone the repo, or pull it via a package manager such as npm, yarn, Bun, Composer, or NuGet. Documentation is built with Astro and hosted on GitHub Pages at getbootstrap.com, with search powered by Algolia DocSearch. The current default branch develops Bootstrap 5; Bootstrap 4 lives on a separate v4-dev branch. The repo language is MDX, which is what the docs are written in.

Copy-paste prompts

Prompt 1
Show me how to install Bootstrap via npm and add a responsive grid layout to my HTML page.
Prompt 2
How do I customize Bootstrap's default colors and spacing using Sass variables?
Prompt 3
Create a Bootstrap navbar with a dropdown menu and a hero section with a call-to-action button.
Prompt 4
Explain how to use Bootstrap's utility classes to add padding, margins, and text alignment without writing CSS.
Prompt 5
How do I use Bootstrap's form components to build a contact form with validation?
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Generated 2026-05-18 · Model: sonnet-4-6 · Verify against the repo before relying on details.