> For the complete documentation index, see [llms.txt](https://bootstrapbay.gitbook.io/circular/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bootstrapbay.gitbook.io/circular/untitled.md).

# Working with Bootstrap

### About Bootstrap

Bootstrap is a free and open-source front-end library for designing websites and web applications. It contains HTML- and CSS-based design templates for typography, forms, buttons, navigation and other interface components, as well as optional JavaScript extensions. It is the most popular library for front-end and used across the world by millions of developers. If you want to find out more about it, you can see the documentation [here](https://getbootstrap.com).

We have used Bootstrap as the basis for Circular and used a lot of its features. If you plan on customising the themes, you should keep in mind that you need to understand how they. We recommend you check out the:

* [Grid System](https://getbootstrap.com/docs/4.1/layout/grid/)
* [Buttons](https://getbootstrap.com/docs/4.1/components/buttons/)
* [Forms](https://getbootstrap.com/docs/4.1/components/forms/)
* [Navbar](https://getbootstrap.com/docs/4.1/components/navbar/)
* [Carousel](https://getbootstrap.com/docs/4.1/components/carousel/)