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<!DOCTYPE html>
<style>
body {
margin: 0;
}
.container {
border: 2px solid black;
columns: 2;
column-fill: auto;
width: 60px;
height: 60px;
background: red;
column-gap: 20px;
overflow: hidden;
}
.mock-rule {
height: 60px;
width: 20px;
position: absolute;
left: 22px;
top: 2px;
background: gold;
}
</style>
<div class="mock-rule"></div>
<div class="container">
<div style="height:120px; background:blue;"></div>
</div>