<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>弹窗</title>
<style>
html,body{
height: 100%;
}
*{
margin: 0;
padding: 0;
}
.a{
height: 100%;
width: 100%;
background: rgba(0,0,0,0.5);
position: absolute;
top:0;
left:0;
display: none;
}
.alert{
height: 400px;
width: 400px;
position: absolute;
background: yellow;
left: 50%;
top: 50%;
margin-top: -200px;
margin-left: -200px;
display: none;
}
body:hover .a{
display: block;
}
body:hover .alert{
display: block;
}
</style>
</head>
<body>
<p>
111111
<br> 11111
<br> 11111
<br> 11111
<br> 11111
<br> 11111
<br> 11111
<br> 11111
<br> 11111
<br> 11111
</p>
<div class="a"></div>
<div class="alert"></div>
</body>
</html>
