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<!DOCTYPE html>
<style>
html {
margin: 0;
font-size: 20px;
}
body {
margin: 1em;
border: 1px solid blue;
}
body > div {
margin-bottom: 2em;
border: 1px solid black;
}
</style>
<body>
<div style="writing-mode: vertical-lr; height: 1em">
<div><span>a</span></div>
</div>
<div style="writing-mode: vertical-lr; height: 1em">
<div><span>a</span></div>
</div>
</body>