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<!DOCTYPE html>
<style>
body { writing-mode: vertical-rl; }
.container {
background: green;
width: 16px;
border: solid black 3px;
height: 400px;
margin: 0 16px;
padding: 2px;
}
.large { width: 32px; }
</style>
There should be no red.
<div class="container"></div>
<div class="container"></div>
<div class="container large"></div>
<div class="container large"></div>
<div class="container"></div>
<div class="container"></div>
<div class="container large"></div>
<div class="container large"></div>
<div class="container"></div>
<div class="container"></div>
<div class="container large"></div>
<div class="container large"></div>