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<!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>