참고
https://sir.kr/qa/?unanswered=&unadopted=&adopted=&sst=wr_num&s_tag=캐러셀&stx=캐러셀&sop=and
https://kin.naver.com/qna/detail.naver?d1id=1&dirId=1060104&docId=473643243&enc=utf8&kinsrch_src=pc_nx_rra&qb=64Sk7J2067KEIOy6kOufrOyFgCDrqZTsnbjsl5A%3D
https://kin.naver.com/qna/detail.naver?d1id=1&dirId=10504&docId=450316231&enc=utf8&kinsrch_src=pc_nx_rra&qb=64Sk7J2067KEIOy6kOufrOyFgCDrqZTsnbjsl5A%3D
표준
코드