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Correction status：qualified
Teacher's comments：还是老问题, 没有作业标题, 代码没放在代码块中, 请认真阅读要求
Collection
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>固定广告案例</title>
<style>
body{
height: 3000px;
}
#box1{
width: 200px;
height: 200px;
background: #cccccc;
position: fixed;
right: 0;
bottom: 0;
}
</style>
</head>
<body>
<div id="box1">
<button onclick="this.parentNode.style.display='none'">X</button>
<h2>你好：欢迎来到这里</h2>
<h1>大家好</h1>
</div>
</body>
</html>