CSS flexbox cheatsheet — searchable reference
Every flexbox property you actually use, grouped so you can find it fast: container setup, main-axis alignment (justify-content), cross-axis alignment (align-items), item sizing (grow, shrink, basis) and a set of common recipes like perfect centering and responsive card rows.
Search by property name or by what you want to do — “center”, “wrap”, “grow” — and copy the exact CSS into your stylesheet. Everything runs in your browser; nothing is uploaded.