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<!DOCTYPE html>
<style>
body { writing-mode: vertical-lr; }
.container {
background: green;
inline-size: 80px;
block-size: 600px;
}
.multicol {
column-count: 2;
column-fill: auto;
column-gap: 0;
block-size: 100px;
inline-size: 160px;
}
</style>
There should be no red.
<div class="multicol">
<div class="container"></div>
</div>