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@@ -0,0 +1,63 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta http-equiv="X-UA-Compatible" content="IE=edge">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>position fixed 测试</title>
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+</head>
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+<body>
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+ <div class="parent bg">
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+ parent box
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+ <div class="fixed-box">
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+ width: 100%;<br/>
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+ height: 100%;<br/>
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+ background-color: red;<br/>
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+ opacity: 0.4;<br/>
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+ position: fixed;<br/>
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+ left: 20px;<br/>
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+ top: 50px;<br/>
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+ </div>
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+ </div>
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+</body>
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+<style>
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+ *{
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+ padding:0;
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+ margin: 0;
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+ }
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+ body{
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+ width: 100%;
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+ height: 100vh;
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+ background-color: #ebe9cc;
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+ display: flex;
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+ justify-content: center;
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+ align-items: center;
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+ }
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+ .bg{
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+ background-color: rgba(89, 89, 89, 0.1);
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+ backdrop-filter: blur(30px);
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+ -webkit-backdrop-filter: blur(30px);
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+ border: 1px solid rgba(255, 255, 255, 0.18);
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+ box-shadow: rgba(14, 14, 14, 0.19) 0px 6px 15px 0px;
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+ -webkit-box-shadow: rgba(14, 14, 14, 0.19) 0px 6px 15px 0px;
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+ border-radius: 4px;
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+ -webkit-border-radius: 4px;
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+ /*color: rgba(128, 128, 128, 0.4);*/
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+ }
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+
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+ .parent{
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+ width: 80%;
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+ height: 80%;
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+ border: 1px solid black;
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+ }
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+ .fixed-box{
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+ width: 100%;
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+ height: 100%;
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+ background-color: red;
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+ opacity: 0.4;
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+ position: fixed;
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+ left: 20px;
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+ top: 50px;
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+ }
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+</style>
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+</html>
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