modern-css

Build web apps and UIs with modern, platform-native CSS instead of JavaScript hacks and heavy libraries. Use whenever creating or modifying web UI: pages, components, layouts, themes, animations, dropdowns, tooltips, modals, carousels, accordions, forms, or any HTML/CSS/frontend work. Produces performant, accessible, elegant interfaces using the full modern CSS platform (container queries, :has(), anchor positioning, view transitions, scroll-driven animations, oklch color, cascade layers, and more).