SMRTR ProgrammingDec 7, 2025Daily.dev

Vanilla CSS is all you need

SMRTR summary

37signals has built three major web applications (Campfire, Writebook, and Fizzy) using only vanilla CSS—no build tools, preprocessors, or frameworks. Their approach leverages modern CSS features like OKLCH colors, container queries, :has() selectors, and CSS layers to create sophisticated interfaces with 14,000 lines of code across a simple flat file structure.

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