>
      <div class="Arrange-sizeFill dev-highlight">
        Main content
      </div>
    </div>
  </div>
  <h3 class="Test-it">renders equal-height columns</h3>
  <div class="Test-run">
    <div class="Arrange">
      <div class="Arrange-sizeFit dev-highlight">
        <div class="fixture-Box"></div>
      </div>
      <div class="Arrange-sizeFill dev-highlight">
        Main content
      </div>
    </div>
  </div>
  <h3 class="Test-it">works with reverse source order</h3>
  <div class="Test-run">
    <d