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<!DOCTYPE html>
<link rel="help" href="https://www.w3.org/TR/css-gaps-1/#outset">
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
.multi-column {
columns: 2;
height: 102px;
column-width: 400px;
width: 804px;
gap: 4px;
}
body {
margin: 0px;
}
#flexbox {
width: 400px;
border: 2px solid #333;
background-color: #fff;
display: flex;
flex-wrap: wrap;
justify-content: space-between;
}
.item {
width: 70px;
height: 50px;
background-color: #007bff;
color: white;
display: flex;
}
.rule {
position: absolute;
top: 2px;
height: 50px;
background: gold;
width: 5px;
}
</style>
<div class="rule" style="left: 76.25px; height: 75px;"></div>
<div class="rule" style="left: 157.75px; height: 75px;"></div>
<div class="rule" style="left: 241.25px; height: 75px;"></div>
<div class="rule" style="left: 322.75px; height: 75px;"></div>
<div class="rule" style="left: calc(76.25px + 404px); top: 0px; height: 25px;"></div>
<div class="rule" style="left: calc(157.75px + 404px); top: 0px; height: 25px;"></div>
<div class="rule" style="left: calc(241.25px + 404px); top: 0px; height: 25px;"></div>
<div class="rule" style="left: calc(322.75px + 404px); top: 0px; height: 25px;;"></div>
<div class="rule" style="top: 25px; left: 494px;"></div>
<div class="rule" style="top: 25px; left: 604px;"></div>
<div class="rule" style="top: 25px; left: 714px;"></div>
<div class="multi-column">
<div id="flexbox">
<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 class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>
</div>