Free, open source CSS framework that provides ready-to-use frontend components that you can easily combine to build responsive web interfaces. It provides a collection of pre-designed CSS classes to help build responsive and modern websites. Very versatile because it does no require any JavaScript.

With Bulma, developers can easily create responsive layouts by leveraging the grid system and making use of the various predefined classes. It offers a wide range of components and elements like buttons, forms, navbar, cards, and more, which can be customized and combined to create a visually appealing website.

Bulma relies on CSS flexbox to handle the alignment and positioning of elements, making it easy to create responsive designs that adjust well across different screen sizes. Additionally, it provides a comprehensive documentation with examples and code snippets, making it user-friendly for developers of all skill levels.