<style>
.container {
  writing-mode: vertical-rl;
  font-family: Monospace;
  font-size: 20px;
}
.inline_block {
  display: inline-block;
  background-color: blue;
  width: 30px;
  height: 30px;
}
</style>
<div class=container>
  PASS if both<div class=inline_block></div><br>
  aligned the same way<div class=inline_block></div>
</div>