22.01.02
scroll-behavior: smooth 이 작동하지 않아요!
https://stackoverflow.com/questions/70553176/smooth-scroll-css-property/70553396#70553396
22.01.09
state 가 자꾸 null로 찍혀요!
https://stackoverflow.com/questions/70638897/state-variable-is-null-after-setting-state/70639009#70639009
