CSS layout framework

Tachyons is a utility-first CSS framework and functional CSS library. It provides a collection of single-purpose classes used to style elements and build layouts without writing custom CSS. The framework centers on a mobile-first responsive design system and a nestable grid architecture that adapts layouts across different screen sizes. It includes accessible color palettes and schemes designed to meet visual contrast and accessibility standards. The system provides tools for utility-first styling, responsive layout management, and visual debugging to resolve alignment and spacing issues.

Foundation Sites is a responsive front-end framework providing a collection of CSS and JavaScript tools to build websites that automatically adapt to different screen sizes and devices. It functions as a responsive design library and cross-browser UI toolkit, offering a grid layout system and pre-styled interface components to ensure consistent rendering across modern web browsers. The framework enables rapid front-end UI prototyping and the integration of interactive components through a scripting interface that manages the lifecycle of UI plugins. It supports custom CSS framework management

Utility-first CSS framework for fast, design-system-friendly styling.

Grommet is a React UI framework and accessible component library designed for building themed user interfaces. It provides a responsive design system and a themed interface toolkit to ensure inclusive user experiences across various screen sizes and device orientations. The framework emphasizes accessible UI development by providing pre-styled elements that follow web accessibility standards for screen readers and keyboard navigation. It enables the implementation of custom themes through a centralized system that manages visual styles and design tokens. The toolkit covers responsive web des

The United States Web Design System is a government design system and accessible UI framework. It provides a collection of standardized CSS and JavaScript components, along with a CSS component library, specifically designed for building consistent federal government websites. The system allows for custom CSS theme development through the use of design tokens for colors, spacing, and typography. Users can customize visual themes and compile custom styles to maintain a unified brand identity across multiple web properties. The framework covers responsive interface design and web accessibility

Spectre is a comprehensive CSS framework and UI utility toolkit designed for building responsive web interfaces. It functions as a CSS component library that provides pre-styled interface elements and helper classes to facilitate frontend UI development. The framework is distinguished by a pure-CSS component architecture that avoids dependence on external JavaScript runtimes. It utilizes a SASS-based build pipeline that supports class prefixing, stylesheet pruning, and a variable-based theme system for creating custom design systems. The project covers a wide range of layout and interface ca

Bulma is a design-agnostic CSS framework that provides a collection of pre-styled interface components and layout primitives. It is built to be independent of specific JavaScript frameworks or build tools, allowing developers to construct responsive web interfaces by applying standardized classes directly to semantic HTML markup. The framework distinguishes itself through a utility-first approach that combines modular component styling with a flexible grid system. It leverages native CSS variables to manage design tokens, enabling real-time visual customization, automatic dark mode adaptation

Bootstrap is a comprehensive, mobile-first CSS framework designed for building responsive web interfaces. It provides a standardized library of reusable UI components, such as navigation bars, modals, and forms, alongside a robust grid system that ensures consistent layout alignment across diverse viewport sizes. By establishing a baseline through browser normalization and standardized typography, the project enables developers to create accessible, cross-browser compatible web applications. The framework distinguishes itself through a modular Sass-based architecture that allows for deep cust

UIkit is a CSS front-end framework and accessible UI component library designed for building responsive web interfaces. It provides a comprehensive set of styling classes and modular components alongside a JavaScript interaction toolkit for managing behavioral elements. The framework includes native support for internationalized web interfaces, featuring multi-locale text translation and right-to-left layout directions. It employs a responsive layout engine that uses flexible grids, adaptive breakpoints, and container widths to align content across different screen sizes. The toolkit covers

Ant Design is an enterprise-grade component library and design system framework built for developing complex, data-heavy web applications. It provides a comprehensive collection of pre-built, state-driven interface elements that map data properties to rendered components, ensuring consistent interaction patterns and visual language across large-scale projects. The library distinguishes itself through a robust styling architecture that utilizes design tokens and hierarchical configuration providers to propagate global settings like themes, locale, and layout direction. By employing component-l

Semantic-UI is an HTML and CSS UI framework consisting of a themed component library and a responsive layout framework. It provides a collection of reusable interface components and a grid-based system of columns and containers designed to build responsive websites. The framework is distinguished by its use of natural-language class naming, which maps human-readable CSS classes to specific visual styles. It also functions as a right-to-left UI toolkit, utilizing directional mirroring to adjust visual flow and element alignment for languages read from right to left. The system covers frontend

Mantine is a comprehensive component library for building accessible and responsive web applications. It provides a foundational set of UI elements and layout primitives, anchored by a base component that supports consistent styling, spacing, and layout properties across the entire interface. The library is built on a design-driven theme engine that uses a provider-based system to propagate global design tokens and color schemes throughout an application. The library distinguishes itself through a robust architecture that emphasizes component composition and reusable interaction logic. It uti

Basscss is a lightweight CSS utility toolkit built on an atomic, single-purpose class architecture. Each class performs exactly one visual function, enabling immutable, side-effect-free styling where no class ever overrides or conflicts with another. The system provides a predefined spacing scale, responsive breakpoint prefixes for conditional styling across device widths, and accessible visibility control that keeps content programmatically available to assistive technologies. The framework distinguishes itself through a float-based grid system that constructs layouts using floated percentag

This project is a Sass implementation of the Bootstrap framework, providing a collection of responsive, mobile-first UI toolkits and layout systems. It serves as a Sass UI library that allows for the creation of custom CSS frameworks through the use of a preprocessor to generate browser-ready stylesheets. The framework is distinguished by its deep customization capabilities, enabling users to override default themes and visual variables using Sass variables and mixins. It utilizes a modular import system, allowing specific components to be selectively included to control the final CSS bundle

HeroUI is a declarative toolkit for building accessible user interfaces through modular, React-based component composition. It provides a comprehensive set of reusable building blocks designed to standardize visual language and interaction patterns across web and mobile applications. The library distinguishes itself through an integrated approach to accessibility and styling. It automatically manages state and keyboard interactions by injecting appropriate attributes, while utilizing a utility-driven styling architecture to enforce design system consistency. Developers can leverage polymorphi

Mobi.css is a lightweight, mobile-first CSS framework designed to provide a consistent foundation for web interface development. It establishes a stable visual baseline by normalizing default browser styles across all platforms, ensuring that standard interface elements like buttons, forms, and text blocks maintain a cohesive appearance. The framework utilizes a flexible grid system based on container models that automatically adjust content dimensions and alignment to fit varying screen sizes and device orientations. By prioritizing mobile constraints and employing viewport-based breakpoints

This project is a comprehensive UI toolkit that provides a declarative, reactive framework for building modular web interfaces. It centers on a component-based architecture that maps application state to rendered elements, utilizing a twelve-point flexbox grid system and nested containers to manage complex layouts. The library ensures consistent behavior across large-scale applications by providing centralized configuration for component defaults, themes, and global design tokens. What distinguishes this framework is its deep integration of Material Design principles alongside a highly flexib

TW-Elements is a Tailwind CSS component library and responsive UI kit providing a collection of pre-styled elements and templates. It functions as an interactive web element set and a customizable theme system for building website interfaces and landing pages. The project enables rapid frontend prototyping through a library of functional interface pieces, including modals, navigation bars, and forms. It provides a set of design blocks and sections specifically for creating mobile-first layouts. The library covers responsive web design and Tailwind CSS UI development. This includes the implem

Suit is a CSS component architecture framework and methodology designed for organizing styles using predictable naming conventions for components, descendants, and visual variations. It serves as a design system styling framework that maps application states and design variations to modular CSS rules. The system utilizes namespace-based CSS scoping to isolate component styles and prevent unintended side effects in global stylesheets. It also functions as a utility-first toolkit, providing a system for applying single-purpose layout and spacing rules to reduce code duplication. The methodolog

Galaxy is a curated CSS UI component library and visual design gallery. It serves as a front-end code snippet manager and a searchable repository of community-sourced HTML and CSS assets. The project provides tools for UI component discovery and design prototyping, allowing users to browse an archive of interface elements and layout patterns. It includes a code export mechanism for copying markup and styling directly into external development workflows. The system supports responsive web design through flexible grid layouts and interface elements that adapt to different screen sizes. A JSON-

Skeleton is a lightweight responsive CSS boilerplate and mobile-first framework. It provides a foundation for building mobile-friendly websites through a fluid 12-column grid system, a minimal CSS reset library to normalize browser defaults, and default styling for raw HTML elements. The project emphasizes a mobile-first development approach, using percentage-based widths and predefined media queries to progressively enhance layouts for larger screens. It includes a utility-first library of single-purpose classes to manage common layout tasks such as floating elements, clearing, and width con

Atomic Layout is a declarative framework for building responsive user interfaces in React. It functions as a layout engine that abstracts complex grid structures into reusable components, allowing for the creation of hierarchical spatial distributions without the need for manual media queries. The library distinguishes itself by mapping visual layout regions to component structures through dynamic grid-template-area generation. It utilizes a property-based system where components accept specific suffixes to automatically trigger responsive style adjustments based on viewport width. By employi

Bootstrap-vue is a Vue.js component library and responsive UI kit based on the Bootstrap CSS framework. It provides a frontend component suite of reusable interface elements designed for building mobile-first websites and web applications. The project wraps Bootstrap CSS classes in Vue components to manage styles and behaviors through reactive state. It integrates a responsive layout management system that synchronizes internal component states with Bootstrap's grid system and device breakpoints. The library covers a wide range of interface capabilities, including data display with sortable

Flexboxgrid is a responsive CSS framework and layout engine based on CSS3 standards. It provides a grid system that uses the flexbox model to arrange page elements into flexible, proportional grids that adapt to different screen sizes and device resolutions. The framework implements a float-free responsive design, utilizing a media-query breakpoint system to adjust layouts and column counts based on viewport width. It employs percentage-based column sizing and negative-margin guttering to maintain consistent spacing and fluid scaling across various displays. The system maps layout configurat

The mdb-ui-kit is a frontend component library and visual extension that combines the Bootstrap 5 framework with Material Design principles. It provides a collection of pre-styled interface elements and responsive web templates to facilitate the development of consistent web applications. The toolkit extends the Bootstrap ecosystem by adding Material Design aesthetics and advanced styling options. It enables rapid prototyping through the use of pre-configured design blocks and provides mechanisms for deep visual customization via SCSS variables and native CSS custom properties, including supp

Rebass is a React design system library that provides a collection of theme-driven, responsive UI primitives. It functions as a theme-based layout engine, using a set of stateless components to standardize spacing, typography, and colors across a user interface. The library distinguishes itself by mapping style properties to a central design theme through a styled-system approach. This allows for responsive style mapping where components automatically adapt their appearance based on screen size and provides the ability to swap underlying HTML elements while preserving styling logic to maintai

This project is a UI component library and web layout framework providing pre-made interface elements and blocks for production-ready web applications. It functions as an AI design system that combines a collection of reusable components with a Model Context Protocol server to enable AI coding agents to discover and install interface elements. The system distinguishes itself through AI-driven automation, using the Model Context Protocol and schema-driven configurations to integrate design rules and installation commands directly into AI agents. This allows for the programmatic implementation

Base Web is a React UI component library and design system implementation. It provides a collection of reusable interface elements and a responsive web framework designed to enforce a consistent visual language and layout across digital products. The project focuses on enterprise design systems and responsive web design, offering tools that automatically adapt user interfaces to fit various screen sizes and devices. It incorporates accessible interface design to ensure components follow standards for users with disabilities. The library utilizes a theme-based design token system and a compos

Papercss is a CSS UI framework and document-style design system used to build responsive web page layouts. It functions as a Less-based CSS library that applies a paper-like aesthetic and structured typography to give web pages the appearance of physical documents. The project also incorporates a utility-first CSS library model for rapid styling. The framework is distinguished by its ability to automate visual decorations, such as applying rotating border styles and shadow effects to child elements. It utilizes a Less-based variable system and modular stylesheet compilation, allowing users to

Material Tailwind is a responsive web UI framework and component library built with Tailwind CSS. It provides a customizable design system that implements Material Design principles for web applications. The project focuses on a customizable design system, allowing for centralized theme configuration and utility-based styling to maintain visual consistency across interfaces. The library includes a wide range of reusable interface elements, covering layout structures, navigation systems, and overlay components. It provides specialized tools for web form construction, data input controls, and

North is a responsive web design methodology and Sass-based CSS architecture framework. It provides a system for building mobile-first user interfaces using fluid grids and progressive enhancement techniques to ensure a consistent experience across different browser capabilities and screen sizes. The project features a standardized CSS naming system that uses Sass mixins to programmatically generate class names, distinguishing between components, layouts, and states. It also functions as a frontend project scaffolding tool, providing a generator to bootstrap new environments with pre-configur

Ariakit is a headless component library and accessible UI component toolkit. It provides a set of unstyled web components with built-in accessibility patterns to ensure that screen readers and keyboard navigation function correctly. The project includes an adaptive color engine that calculates high-contrast text and dynamic surface colors for light and dark modes. It also features a concentric layout engine for computing nested padding, margins, and border radii for circular interface elements, alongside a design token system for managing global CSS variables. The toolkit covers broad capabi

Material Kit is an open-source UI component library that provides pre-styled Material Design elements for building responsive web interfaces with Bootstrap 5. It offers a collection of reusable components like buttons, inputs, navbars, cards, and modals that follow Google's Material Design guidelines, along with a 12-column flexbox grid system for fluid layouts that adapt to any screen size. The kit distinguishes itself by including pre-built page sections such as headers, feature blocks, pricing tables, and footers that can be combined into complete page layouts, reducing the time needed to

This project is a responsive layout framework for Angular that provides a system of directives to create adaptive user interfaces using CSS Flexbox and CSS Grid. It includes specialized libraries for managing flexible box alignment and structuring complex two-dimensional page grids. The framework features a breakpoint monitoring service to programmatically observe media query changes and trigger logic when viewport dimensions cross defined boundaries. To optimize performance, it includes a build-time CSS generator that uses SASS mixins to create static media query stylesheets, reducing the ne

CSS Layout is a pure CSS pattern library that provides pre-built layout components for common page structures, implemented entirely with CSS using flexbox and grid. The collection focuses on reusable, encapsulated components that handle overlapping elements, vertical centering, sticky footers, and classic page layouts without requiring any JavaScript for rendering or interactivity. The library offers a range of practical layout implementations including centered navigation menus, element stacking techniques, holy grail page layouts, and responsive grid systems. Each pattern is built as a self

Gestalt is a type-safe React UI component library and design system. It provides a collection of reusable interface elements and design tokens that follow international accessibility standards to ensure usability for people with diverse needs. The framework includes a responsive web layout system with defined breakpoints and grid containers that adapt interfaces for desktop, mobile, and tablet devices. It features an internationalized component suite that supports multiple languages, regional color schemes, and right-to-left text orientations. The library covers a broad range of interface ca

Layui is a web UI component library, frontend layout framework, and CSS asset optimizer. It provides a collection of pre-styled visual elements and layout patterns used to build browser-native web interfaces. The framework enables the composition of structured web pages through standardized design assets and CSS components. It includes tools for compressing stylesheets and resolving imports to improve loading speeds across different web browsers. The library covers web UI development and frontend layout composition, facilitating rapid interface prototyping by assembling functional frontends

This project is a React component library and web UI design system designed for creating interactive web interfaces. It functions as a responsive frontend framework that provides a collection of modular building blocks to ensure visual consistency across different application pages and devices. The system utilizes a CSS-in-JS styling framework that generates and injects styles at runtime through a centralized property injection system. This approach allows for the implementation of a theme-driven architecture where layouts and color themes automatically adjust based on screen size and user pr

Pure is a CSS UI framework and modular component library designed for building consistent web layouts and interface components. It functions as a responsive CSS grid system and a CSS reset library that normalizes default browser rendering to ensure a uniform appearance across different web environments. The project provides standalone styles for common interactive elements such as buttons, menus, forms, and tables. It utilizes a modular architecture that allows for the inclusion of specific style modules and employs namespace isolation to prevent visual conflicts between components. The fram

A minimalist CSS framework.

Water.css is a minimalist, classless CSS framework and library designed to apply visual improvements directly to standard HTML elements. It maps curated styles to native tags, allowing for clean and professional website interfaces without the need for custom class names. The library features an adaptive theme system that automatically switches between light and dark color schemes based on operating system user preferences. It also uses root-level CSS variables, enabling the customization of base colors and spacing to create unique visual identities. The project provides capabilities for rapi

inuit.css is a Sass-based CSS framework and design system tool focused on building scalable user interfaces. It serves as a modular preprocessor system that utilizes BEM architecture and OOCSS patterns to structure stylesheets into reusable components and layout abstractions. The framework distinguishes itself by separating structural layout logic from visual skinning, allowing for the creation of design-agnostic layout objects. It employs a configuration-driven build process where developers can use feature switches and variable overrides to inject design tokens and selectively include only

Golden Grid System is a responsive CSS grid framework designed for structuring fluid, multi-column web pages that automatically adapt to different screen sizes. It functions as a fluid layout generator, providing a responsive design tool for arranging flexible layouts that fold gracefully across desktop, tablet, and mobile devices from a single layout foundation. The framework supports multi-device web development by using proportional fluid sizing to scale container widths and column dimensions dynamically with mathematical percentages rather than fixed pixel values. It handles layout foldin

Codyhouse Framework is a front-end design system framework and CSS utility framework that provides an accessible UI component library for building bespoke user interfaces. It combines modular component authoring, semantic accessible markup, and utility-first styling classes with design-token-driven styling to enforce consistent visual design rules across web projects. The platform includes global design token configuration for color palette generation, typography scales, spacing rules, and interactive element themes. It supports build-time asset optimization by removing unused style rules dur

Golden Layout is a framework-agnostic UI container and web window layout manager designed to organize application interfaces into a flexible grid of draggable and resizable multi-pane windows. It functions as a hierarchical grid system that arranges page elements into a tree of nested rows and columns to create complex professional interfaces. The system acts as a multi-window workspace orchestrator, allowing components to be detached from the main layout into independent native browser windows. It also serves as a serializable layout engine that captures the arrangement of user interface com

Metro UI is a progressive front-end framework for building reactive single-page applications with a Metro-style design language. It provides a component-based UI library with over 150 prebuilt interface elements, a reactive state model that automatically updates the DOM when application data changes, and a responsive grid layout system for mobile-first web development. The framework uses an HTML-first approach where interactive interfaces are assembled by adding custom HTML attributes to elements, eliminating the need for manual JavaScript glue code. It includes a hash-based SPA router for na

Mobile-angular-ui is a frontend framework designed for building touch-friendly mobile web applications using AngularJS and Bootstrap styles. It provides a toolkit for creating cross-platform interfaces with native-like gestures and responsive layouts, enabling developers to transform standard desktop web interfaces into touch-friendly mobile layouts with minimal structural adaptations. The framework includes directive-driven UI components such as sidebars, overlays, switches, and navigation bars. It supports declarative state management through generic directives that bind state transformatio

From community websites to web applications, this CSS framework will help you achieve a consistent look and feel.