Bootstrap

Bootstrap is an intuitive and powerful front-end framework used to simplify and speed up development of websites and web apps, making web products run perfectly on any device. Its feature-rich toolkit contains numerous useful tools, including LESS and SASS CSS preprocessors, custom CSS and HTML components, jQuery plugins and JavaScript extensions, among many others. Thanks to this, Bootstrap is chosen by millions of websites worldwide (including Twitter, Huffington Post, Spotify, Vine, etc.)