JSFiddle - React, Tailwind, and code Playground

HTML

<div class="table">
  <div class="row">
    <div class="column">
      top left
    </div>
    <div class="column">
      top right
    </div>
  </div>
  <div class="row">
    <div class="column two-col">
      middle two columns
    </div>
  </div>
  <div class="row">
    <div class="column">
      bottom left
    </div>
    <div class="column">
      bottom right
    </div>
  </div>
</div>

</div>

CSS

.table {
  display:table;
}
.row {
  display:table-row;  
}
.column {
  display:table-cell;
  border:1px solid black;
}
.two-col {
  column-span:2;
  -webkit-column-span:2;
}