<!DOCTYPE html>
<html>
<head>
<style>
    img {
        background-color: green;
        height: 500px;
        width: 500px;
    }

    .backdrop {
        position: absolute;
        height: 200px;
        width: 200px;
        left: 140px;
        top: 140px;
        background-color: rgba(0, 0, 0, 0.2);
        -webkit-backdrop-filter: saturate(0);
    }
    
    .extender {
        position: absolute;
        height: 20px;
        width: 20px;
        top: -100px;
        left: -100px;
        background-color: blue;
    }
}
</style>
</head>
<body>
	<img>
	<div class="backdrop">
	    <div class="extender"></div>
	</div>
</body>
</html>