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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;
}
.flex-item {
background: gray;
opacity: 0.5;
width: 100px;
}
.col-gap {
position: absolute;
top: 0px;
width: 0px;
height: 100px;
border-left: solid 10px;
}
.col-gap1 {
left: 105px;
border-left-color: blue;
}
.col-gap2 {
left: 225px;
border-left-color: green;
}
</style>
<div class="flex-container">
<div class="flex-item"></div>
<div class="flex-item"></div>
<div class="flex-item"></div>
</div>
<div class="col-gap col-gap1"> </div>
<div class="col-gap col-gap2"> </div>