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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: 90px;
height: 350px;
}
.lanes {
display: grid-lanes;
grid-lanes-direction: row;
grid-template-rows: repeat(auto-fit, 50px);
gap: 10px;
width: max-content;
height: 350px;
background: #cdd5e0;
}
.lanes > div {
width: 40px;
background: #5b8def;
}
.t3 { grid-row: 3; }
.t4 { grid-row: 4; }
.t5 { grid-row: 5; }
.t6 { grid-row: 6; }
.col-rule {
position: absolute;
left: 43px;
width: 0;
height: 50px;
border-left: 4px solid gold;
}
.row-rule {
position: absolute;
left: 0;
width: 90px;
height: 0;
border-top-width: 4px;
border-top-style: solid;
}
</style>
<div class="stage">
<div class="lanes">
<div class="t3"></div>
<div class="t3"></div>
<div class="t4"></div>
<div class="t4"></div>
<div class="t5"></div>
<div class="t5"></div>
<div class="t6"></div>
<div class="t6"></div>
</div>
<div class="col-rule" style="top: 0;"></div>
<div class="col-rule" style="top: 60px;"></div>
<div class="col-rule" style="top: 120px;"></div>
<div class="col-rule" style="top: 180px;"></div>
<div class="row-rule"
style="top: 53px; border-top-color: red;"></div>
<div class="row-rule"
style="top: 113px; border-top-color: blue;"></div>
<div class="row-rule"
style="top: 173px; border-top-color: green;"></div>
</div>