<!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>Document</title>
<style>
.m-test{position: relative; color: red;font-size: 30px;}
.m-test2{position: absolute;top: 0;left: 0;right: 0;bottom: 0;background-color: hsla(0,0%,100%,.32)!important;backdrop-filter: blur(2px);}
</style>
</head>
<body>
<div class="m-test">
hello,world!
<div class="m-test2"></div>
</div>
</body>
</html>