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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;
width: max-content;
background: #cdd5e0;
}
.lanes > div {
width: 60px;
height: 40px;
background: #5b8def;
}
.track-one { grid-column: 1; }
.track-two { grid-column: 2; }
.col-rule { position: absolute; top: 0; width: 0; height: 280px; border-left: 4px solid blue; }
</style>
<div class="case">
<div class="lanes">
<div class="track-one"></div>
<div class="track-one"></div>
<div class="track-one"></div>
<div class="track-one"></div>
<div class="track-one"></div>
<div class="track-two"></div>
</div>
<div class="col-rule" style="left: 68px;"></div>
<div class="col-rule" style="left: 148px;"></div>
</div>