CSS controls presentation, including layout, colors, typography and responsive styles. HTML describes document structure, while CSS describes its presentation. Tailwind CSS is a tool built around CSS rather than the language itself.
Term
层叠样式表（CSS）Next Token / Wiki
Cascading Style Sheets (CSS)
A style-sheet language describing the presentation of documents, including layout, colors and fonts.
Also known as
CSS · 层叠样式表 · Cascading Style Sheets