Primer CSS Components Complete Reference Last Updated : 07 Apr, 2025 Summarize Comments Improve Suggest changes Share Like Article Like Report Primer CSS is a free open-source CSS framework that is built upon systems that create the foundation of the basic style elements such as spacing, typography, and color. 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This systematic method makes sure our patterns are steady and interoperable with every other Primer CSS Marketing Buttons Primer CS 1 min read Primer CSS Utility Complete Reference Primer CSS is a free open-source CSS framework that is built upon systems that create the foundation of the basic style elements such as spacing, typography, and color. This systematic method makes sure our patterns are steady and interoperable with every other Primer CSS Animations Primer CSS Fade 2 min read Spectre Components Complete Reference Spectre is a lightweight, responsive, and modern CSS framework, which provides extensible with faster development. There are various components available in the Spectre framework. 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