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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(4, 60px);
gap: 20px;
width: max-content;
background: #cdd5e0;
}
.lanes > div { height: 60px; }
.first {
grid-column: 1;
background: #5b8def;
}
.spanner {
grid-column: 2 / span 2;
justify-self: start;
width: 60px;
background: #8a6df0;
}
.fourth {
grid-column: 4;
background: #5b8def;
}
.col-rule { position: absolute; top: 0; width: 0; height: 60px; border-left: 4px solid blue; }
</style>
<div class="case">
<div class="lanes">
<div class="first"></div>
<div class="spanner"></div>
<div class="fourth"></div>
</div>
<div class="col-rule" style="left: 68px;"></div>
<div class="col-rule" style="left: 228px;"></div>
</div>