officedev/office-ui-fabric-core

Office UI Fabric Core is a CSS framework published by Microsoft for building web experiences that look and feel like Office and Microsoft 365 products. It provides the foundational visual styles that Microsoft uses across its productivity applications: typography, color palettes, icons, fonts, spacing rules, and a responsive grid system. If you are building a web app, an Office Add-in, or anything else that needs to match the look of Microsoft Office, this library gives you the base styles to do that without designing them yourself. You include the CSS in your project, apply the provided class names to your HTML elements, and your content takes on the Office design language. This repository covers only the core styles. There is a companion project called Office UI Fabric React that provides the actual interactive components (buttons, dropdowns, menus, etc.) built as React components. The two projects are separate: this one handles the visual foundation, the React project handles the components. The library is available through common package managers including npm, Bower, and NuGet, or it can be loaded directly from a CDN without installing anything. Microsoft also offers a customization path if you need to adjust the default styles to fit your own brand while still following the Office design patterns. The project is maintained by Microsoft's Office developer team and is licensed under the MIT license. The fonts and icons it references are loaded from a CDN and carry a separate asset license. The repository's issue tracker is used for bug reports and feature requests, and the project has a contribution guide for developers who want to submit changes.