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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
.multi-column {
columns: 2;
height: 150px;
column-width: 100px;
width: 330px;
}
body {
margin: 0px;
}
#flexbox {
border: 2px solid rgb(96 139 168);
display: flex;
column-gap: 10px;
row-gap: 20px;
width: 90px;
flex-wrap: wrap;
flex-direction: column;
height: 200px;
align-items: center;
justify-content: center;
}
.items {
background-color: rgb(96 139 168 / 0.2);
width: 30px;
height: 30px;
}
.column-rule {
background-color: blue;
position: absolute;
height: 100px;
width: 10px;
}
.row-rule {
background-color: gold;
position: absolute;
height: 20px;
/* Last flex line cross size is 40 rather than 30. */
width: 90px;
}
</style>
<div class="column-rule" style="top: 2px; left: 47px;"></div>
<div class="column-rule" style="top: 0px; left: 220px;"></div>
<div class="row-rule" style="left: 7px; top: 42px"></div>
<div class="row-rule" style="left: 180px; top: 30px"></div>
<div class="multi-column">
<div id="flexbox">
<div class="items">1</div>
<div class="items">2</div>
<div class="items">3</div>
<div class="items">4</div>
<div class="items">5</div>
<div class="items">6</div>
<div class="items">7</div>
<div class="items">8</div>
</div>
</div>