<!DOCTYPE html>
<style>
  .multicol {
    column-count: 2;
    column-fill: auto;
    column-gap: 0px;
  }
  #outer {
    height: 120px;
    width: 100px;
  }
  #inner {
    width: 50px;
    column-gap: 16px;
    height: 100px;
    padding: 10px;
  }
  #ref {
    height: 400px;
    width: 25px;
    background-color: green;
  }
</style>
<div class="multicol" id="outer">
  <div class="multicol" id="inner">
    <div id="ref"></div>
  </div>
</div>
