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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
body {
margin: 0px;
}
.grid {
display: grid;
grid-template: repeat(auto-fill, 100px) / repeat(3, 100px);
grid-gap: 20px;
left: 0px;
top: 0px;
}
.item {
width: 100px;
height: 100px;
background: lightgray;
}
.column-decoration {
position: absolute;
top: 0px;
height: 340px;
width: 3px;
background: red;
height: 105px;
}
.row-decoration {
position: absolute;
height: 3px;
background-color: gray;
width: 334px;
left: 1px;
}
</style>
<div class="column-decoration" style="left: 108.5px"></div>
<div class="column-decoration" style="left: 228.5px"></div>
<div class="column-decoration" style="left: 108.5px; top: 120px;"></div>
<div class="column-decoration" style="left: 228.5px; top: 120px;"></div>
<div class="column-decoration" style="left: 108.5px; top: 240px; height: 100px"></div>
<div class="column-decoration" style="left: 228.5px; top: 240px; height: 100px"></div>
<div class="row-decoration" style="top: 108.5px;"></div>
<div class="row-decoration" style="top: 228.5px;"></div>
<div class="grid">
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>