https://velog.io/@ash3767/React-build-sourcemap-delete
https://www.w3schools.com/cssref/css3_pr_mediaquery.asp
https://velog.io/@ash3767/apple-part2-3-b8r9z40c
https://velog.io/@ash3767/apple-part2-4-LinkSwitch-history
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https://velog.io/@ash3767/Handle-Browser-Window-Resize-in-React
https://velog.io/@ash3767/react-hooks-useEffect
https://reacttraining.com/blog/react-router-v5-1/
https://velog.io/@ash3767/scss