<!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>