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<!DOCTYPE html>
<html>
<head>
<style>
.group {
border: solid black 1px;
padding: 20px;
margin: 10px;
width: max-content;
}
.outer {
display: inline-block;
border: 1px solid black;
padding: 10px;
row-gap: 20px;
}
.container {
display: flex;
flex-wrap: wrap;
width: 150px;
}
.container-zoom {
display: flex;
flex-wrap: wrap;
width: 300px;
}
.container > div {
background-color: black;
flex: 1 1 auto;
width: 100px;
height: 20px;
}
.container-zoom > div {
background-color: black;
flex: 1 1 auto;
width: 200px;
height: 40px;
}
.spacer {
display: inline-block;
width: 20px;
}
</style>
</head>
<body>
<p>Each grouping below should have two matching boxes.</p>
<div class="group">
<div class="outer">
<div class="container" style="row-gap: 20px;">
<div></div>
<div></div>
</div>
</div>
<div class="spacer"></div>
<div class="outer">
<div class="container" style="row-gap: 20px;">
<div></div>
<div></div>
</div>
</div>
</div>
<div class="group">
<div class="outer">
<div class="container-zoom" style="row-gap: 40px;">
<div></div>
<div></div>
</div>
</div>
<div class="spacer"></div>
<div class="outer">
<div class="container-zoom" style="row-gap: 40px;">
<div></div>
<div></div>
</div>
</div>
</div>
</body>
</html>