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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-gaps-1/">
<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
<style>
body {
margin: 0px;
}
.container {
display: grid;
grid-template: repeat(3, 100px) / repeat(3, 100px);
gap: 20px;
}
.col-rule {
height: 220px;
width: 0px;
position: absolute;
left: 107px;
top: 0px;
border-right: 6px solid rgba(128 0 0 / 0.5);
}
.row-rule {
height: 0px;
width: 233px;
position: absolute;
left: 0px;
top: 107px;
border-bottom: 6px solid rgba(0 0 128 / 0.5);
}
.item {
background: rgba(192 192 192 / 0.75);
}
</style>
<div class="container">
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>
<div class="col-rule"></div>
<div class="col-rule" style="left: 227px; height: 113px; top: 0px;"></div>
<div class="row-rule"></div>