<script>
document.getElementById('hello').style.color = "red";
document.getElementById('hello').style.background = "rgb(0,0,0)";
document.getElementById('hello').style.background = "#000000";
</script>
Last updated
.alert-box {
background-color: cornflowerblue;
padding: 20px;
color: white;
border-radius: 5px;
display: none;
}
/* css 파일생성 */<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="main.css">
</head>
<body>
<div id="alert" class="alert-box" >
알림창
<button onclick="document.getElementById('alert').style.display = 'none'">닫기</button>
</div>
<button onclick="document.getElementById('alert').style.display = 'block'">알림창을 보여줘!</button>
</body>
</html>