class="test secondRow"></div>
</div>

<div class="grid" style="grid-template-rows: 30px 30px;">
  <div class="item secondRow">X X X</div>
  <div class="spanningItem">XXX XXX</div>
  <div class="test firstRow"></div>
  <div class="test secondRow"></div>
</div>

<div class="grid" style="grid-template-rows: 90px;">
  <div class="item">XXX XXX XXX</div>
  <div class="test firstRow"></div>
</div>

<div class="grid" style="grid-template-rows: 47.5px 47.5px;">
  <div class="spanningItem">XXX XXX XXX</div>
  <div c