css/css-multicol/multicol-nested-033-ref.html

<!DOCTYPE html>
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">

<style>
.multicol {
  column-count: 2;
  column-fill: auto;
  column-gap: 0;
}
#outer {
  width: 100px;
  height: 100px;
}
#nested {
  width: 100%;
  height: 200px;
  column-gap: 15px;
}
#abscb {
  position: relative;
  width: 100%;
  height: 50px;
}
#abspos {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 400px;
  background: green;
}
</style>

<div id="outer" class="multicol">
  <div id="nested" class="multicol">
    <div id="abscb">
      <div id="abspos"></div>
    </div>
  </div>
</div>