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<!DOCTYPE html>
<html>
<head>
<style>
.site-header {
position: relative;
z-index: 7;
}
.dropnav {
visibility: hidden;
}
.dropnav:after {
-webkit-backdrop-filter:blur(5px);
backdrop-filter:blur(5px);
content:"";
height:calc(100vh - 70px);
position:fixed;
width:100%;
}
</style>
</head>
<body>
<header class="site-header">
<div class="dropnav">
<span>App</span>
</div>
</header>
<div style="position: relative; top: 100px; left: 100px; width: 200px; height: 200px; background: blue;"></div>
</body>
</html>
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