두번째 강의 숙제 부분인데 코드를 이렇게 짜면 왜 안되는건가요?
<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<link rel="stylesheet" href="main.css" />
</head>
<body>
<div class="alert-box" id="alert">
알림창임<button id="close">닫기</button>
</div>
<button onclick="document.getElementById('alert').style.display = 'block'">
버튼
</button>
<button
onclick="document.getElementById('close').style.display = 'none'"
></button>
</body>
</html>
