w-*, h-*, min-w, max-w, min-h, max-h — 완전한 사이징 시스템
w-1/4
w-1/3
w-1/2
w-2/3
w-3/4
w-full
max-w-sm (640px)
max-w-md (768px)
max-w-lg (1024px)
max-w-full