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body { writing-mode: vertical-lr; text-orientation: sideways-right; }
#outer { width: 0; height: 0; }
In a 600px container, the minimum font size at 15em per line is 40px.
This means we map 0px-60px into 40px-60px, so 12px gets mapped to 44px.
#inner { font-size: 44px; width: 100%; height: 100%; }
<div id="outer">
<div id="inner">Inflated?