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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<style>
.block {
background-color: blue;
margin: 10px;
height: 100px;
width: 100px;
}
.fade-out {
opacity: 0.5;
}
.flex {
display: flex;
}
</style>
<body>
<div id="ancestor" class="flex">
<div id="scope" class="block fade-out"></div>
<div class="block"></div>
</div>
</body>
</html>