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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: max-content;
}
.lanes > div {
grid-column: 1;
background: #5b8def;
}
.first { height: 60px; }
.second { height: 40px; }
.row-rule { position: absolute; height: 0; border-top: 4px solid gold; }
</style>
<div class="case">
<div class="lanes">
<div class="first"></div>
<div class="second"></div>
</div>
<div class="row-rule" style="left: 0; top: 68px; width: 60px;"></div>
</div>