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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
body { margin: 0; }
.case { position: relative; width: max-content; }
.lanes {
display: grid-lanes;
grid-template-columns: repeat(3, 60px);
gap: 20px;
background: #cdd5e0;
width: 220px;
height: 120px;
}
.col-rule { position: absolute; width: 0; border-left: 4px solid blue; }
</style>
<div class="case">
<div class="lanes"></div>
<div class="col-rule" style="left: 68px; top: 0; height: 120px;"></div>
<div class="col-rule" style="left: 148px; top: 0; height: 120px;"></div>
</div>