<!DOCTYPE html>
<style>
div {
  position: absolute;
}
.content {
  width: 100px;
  height: 150px;
  position: absolute;
  background: blue;
}
</style>
Below should be a light blue square in uniform color.
<div style="opacity: 0.5; will-change: opacity">
  <div class="content" style="left: 0"></div>
  <div class="content" style="left: 50px"></div>
</div>
