![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Correction status：qualified
Teacher's comments：
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>遮罩效果</title>
<style>
body{
margin: 0;
background: url(images/php.png);
background-size: cover;
background-repeat: no-repeat;
}
.box{
position: absolute;
width: 100%;
height: 100%;
left: 0;
top: 0;
background: black;
opacity: 0.7;
}
.login{
position: absolute;
top:50%;
left: 50%;
margin-left:-170px;
margin-top:-210px;
}
.login img{
width: 340px;
height: 420px;
}
</style>
</head>
<body>
<div class="box"></div>
<div class="login">
<img src="images/login.png" alt="">
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
网站实现简单的模拟遮罩效果。
