<div class="flexbox column" style="padding-top: 10px; padding-left: 20px;">
  <div class="rect" data-offset-x="20" data-offset-y="10"></div>
</div>

<div class="flexbox" style="writing-mode: vertical-lr; padding-top: 10px; padding-left: 20px;">
  <div class="rect" data-offset-x="20" data-offset-y="10"></div>
</div>

<div class="flexbox column" style="writing-mode: vertical-lr; padding-top: 10px; padding-left: 20px;">
  <div class="rect" data-offset-x="20" data-offset-y="10"></div>
</div>

<div class="flexbo