The author describes migrating away from Tailwind CSS after 8 years to vanilla CSS with semantic HTML. They learned to structure CSS using systems inspired by Tailwind including resets, components, color palettes, and font scales. Key changes include organizing CSS by components, using CSS variables for consistency, adopting CSS Grid for responsive design, and implementing a minimal build system with esbuild. The migration was motivated by wanting more flexibility, better CSS skills, and curiosity about semantic HTML approaches.