<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>position fixed 测试</title>
</head>
<body>
<div class="parent bg">
parent box
<div class="fixed-box">
width: 100%;<br/>
height: 100%;<br/>
background-color: red;<br/>
opacity: 0.4;<br/>
position: fixed;<br/>
left: 20px;<br/>
top: 50px;<br/>
</div>
</div>
</body>
<style>
*{
padding:0;
margin: 0;
}
body{
width: 100%;
height: 100vh;
background-color: #ebe9cc;
display: flex;
justify-content: center;
align-items: center;
}
.bg{
background-color: rgba(89, 89, 89, 0.1);
backdrop-filter: blur(30px);
-webkit-backdrop-filter: blur(30px);
border: 1px solid rgba(255, 255, 255, 0.18);
box-shadow: rgba(14, 14, 14, 0.19) 0px 6px 15px 0px;
-webkit-box-shadow: rgba(14, 14, 14, 0.19) 0px 6px 15px 0px;
border-radius: 4px;
-webkit-border-radius: 4px;
/*color: rgba(128, 128, 128, 0.4);*/
}
.parent{
width: 80%;
height: 80%;
border: 1px solid black;
}
.fixed-box{
width: 100%;
height: 100%;
background-color: red;
opacity: 0.4;
position: fixed;
left: 20px;
top: 50px;
}
</style>
</html>