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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
body { margin: 0; }
.stage {
position: relative;
width: 170px;
height: 350px;
}
.lanes {
display: grid-lanes;
grid-lanes-direction: row;
grid-template-rows: [top] 80px [fit-start] repeat(auto-fit, 80px) [fit-end] 80px [bottom];
gap: 10px;
width: max-content;
height: 350px;
background: #cdd5e0;
}
.lanes > div {
width: 80px;
background: #5b8def;
}
.top { grid-row: top / fit-start; }
.bottom { grid-row: fit-end / bottom; }
.col-rule {
position: absolute;
left: 83px;
width: 0;
height: 80px;
border-left: 4px solid blue;
}
.row-rule {
position: absolute;
left: 0;
top: 83px;
width: 170px;
height: 0;
border-top: 4px solid gold;
}
</style>
<div class="stage">
<div class="lanes">
<div class="top"></div>
<div class="top"></div>
<div class="bottom"></div>
<div class="bottom"></div>
</div>
<div class="col-rule" style="top: 0;"></div>
<div class="col-rule" style="top: 90px;"></div>
<div class="row-rule"></div>
</div>