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<!DOCTYPE html>
<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
<style>
body {
margin: 0;
}
.multi-column {
position: relative;
columns: 2;
column-width: 170px;
column-gap: 10px;
height: 175px;
width: 350px;
background: lightgray;
column-fill: auto;
}
#flexbox {
display: flex;
flex-direction: column;
flex-wrap: wrap;
width: 170px;
height: 290px;
row-gap: 10px;
column-gap: 10px;
}
.items {
background-color: cornflowerblue;
width: 50px;
height: 50px;
}
.row-rule {
position: absolute;
width: 50px;
height: 10px;
}
.col-rule {
position: absolute;
width: 10px;
background: purple;
}
</style>
<div class="multi-column">
<div class="row-rule" style="top: 50px; left: 0; background: red;"></div>
<div class="row-rule" style="top: 110px; left: 0; background: green;"></div>
<div class="row-rule" style="top: 50px; left: 60px; background: orange;"></div>
<div class="row-rule" style="top: 110px; left: 60px; background: red;"></div>
<div class="row-rule" style="top: 50px; left: 120px; background: yellow;"></div>
<div class="row-rule" style="top: 110px; left: 120px; background: orange;"></div>
<div class="col-rule" style="top: 0; left: 50px; height: 175px;"></div>
<div class="col-rule" style="top: 0; left: 110px; height: 175px;"></div>
<div class="row-rule" style="top: 50px; left: 180px; background: yellow;"></div>
<div class="row-rule" style="top: 50px; left: 240px; background: blue;"></div>
<div class="row-rule" style="top: 50px; left: 300px; background: green;"></div>
<div class="col-rule" style="top: 0; left: 230px; height: 115px;"></div>
<div class="col-rule" style="top: 0; left: 290px; height: 115px;"></div>
<div id="flexbox">
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
<div class="items"></div>
</div>
</div>