<!DOCTYPE html>
<meta charset="utf-8">
<div style="opacity: 0.9999;">
<div class="circle filter"></div>
</div>
<style>
div {
position: absolute;
width: 100px;
height: 100px;
top: 10px;
left: 10px;
background: green;
}
.circle {
top: 30px;
left: 30px;
border-radius: 50px;
background: #ffff0060;
}
.filter {
backdrop-filter: invert(1);
}
</style>