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<!DOCTYPE html>
<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
<style>
body {
margin: 0px;
}
.flex-container {
display: flex;
gap: 20px;
width: 340px;
height: 100px;
column-rule-color: red;
column-rule-style: solid;
column-rule-width: 10px;
}
.flex-item {
background: gray;
opacity: 0.5;
width: 100px;
}
</style>
<div class="flex-container">
<div class="flex-item"></div>
<div class="flex-item"></div>
<div class="flex-item"></div>
</div>