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<!DOCTYPE html>
<style>
body {
margin: 0;
}
.multi-col {
position: relative;
columns: 3;
column-fill: auto;
column-gap: 10px;
width: 320px;
height: 10px;
background: lightgray;
}
.grid-container {
display: grid;
grid-template-columns: repeat(2, 1fr);
grid-template-rows: 10px;
column-gap: 10px;
padding-block-start: 20px;
}
.grid-item {
background: skyblue;
}
.column-rule {
position: absolute;
left: 267px;
top: 0;
width: 6px;
height: 10px;
background: blue;
}
</style>
<div class="multi-col">
<div class="grid-container">
<div class="grid-item"></div>
<div class="grid-item"></div>
</div>
<div class="column-rule"></div>
</div>