๐ box-shadow: none | x-position y-position blur spread color | inset | initial | inherit
โ ์ฐธ๊ณ : https://inpa.tistory.com/entry/CSS-%F0%9F%92%8D-%EA%B7%B8%EB%A6%BC%EC%9E%90box-shadow-%EB%94%94%EC%9E%90%EC%9D%B8-%F0%9F%96%8C%EF%B8%8F-%EB%AA%A8%EC%9D%8C#box-shadow_%EC%83%9D%EC%84%B1%EA%B8%B0