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<!DOCTYPE html>
<title>
CSS Gap Decorations: flex column gaps are painted on overflowing items with negative margin.
</title>
<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
<style>
body {
margin: 0 0 0 200px;
}
#flexbox>* {
background-color: rgb(96 139 168 / 0.2);
}
#flexbox {
border: 2px solid rgb(96 139 168);
border-width: 2px;
display: flex;
column-gap: 10px;
column-rule-style: solid;
column-rule-width: 10px;
column-rule-color: red;
width: 200px;
flex-wrap: nowrap;
}
.items {
width: 50px;
height: 50px;
flex-shrink: 0;
}
.column-gap {
display: flex;
margin-left: 50px;
padding: 0px;
height: 10px;
width: 300px;
position: absolute;
top: 2px;
height: 50px;
left: 52px;
column-gap: 50px;
}
.columns {
background-color: red;
width: 10px;
height: 50px;
}
</style>
<div id="flexbox">
<div class="items" style="margin-left: -150px">One</div>
<div class="items">Two</div>
<div class="items">Three</div>
<div class="items">Four</div>
<div class="items">Five</div>
<div class="items">Six</div>
</div>
<div class="column-gap">
<div class="columns"></div>
<div class="columns"></div>
<div class="columns"></div>
<div class="columns"></div>
<div class="columns"></div>
</div>