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UI ์์์ ๋ง๋๋ ๋ฒ 1. ๋ฏธ๋ฆฌ html/css ๋์์ธ ๋ง๋ค๊ธฐ 2. ํ์ํ ๋ ๋ณด์ฌ๋ฌ๋ผ๊ณ js ์งฌ ์๋ฆผ์ฐฝ์ ๋ฒํผ .alert-box { background-color: skyblue; padding:20px; color:white; border-radius: 5px; display:none; } ๋ฒ์ธ: ์๋ฆผ์ฐฝ ๋ซ๊ธฐ ๋ฒํผ ๋ง๋๋ ๋ฒ ์๋ฆผ์ฐฝ์ ์๋ฆผ์ฐฝ๋ซ๊ธฐ๋ฒํผ .alert-box { background-color: skyblue; padding:20px; color:white; border-radius: 5px; display:block; } ์๋ฆผ์ฐฝ์ ๋ซ๊ธฐ๋ฒํผ ์ด๊ธฐ๋ฒํผ