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 the package manager, or download the source code. Bootstrap utilizes Sass for 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. Import one stylesheet and you're off to the races with every feature of our CSS. The easiest way to customize Bootstrap, include only the CSS you need. Bootstrap 5 is evolving with each release to better utilize CSS variables for global theme styles, individual components, and even utilities. We provide dozens of variables for colors, font styles, and more for use anywhere.