Vertically Aligned Boxes

<div class="flex flex-col justify-between w-full bg-gray-200 h-64 py-8">
  <div class="justify-start bg-gray-400 h-16 w-1/3 mx-auto">&nbsp;</div>
  <div class="justify-end bg-gray-400 h-16 w-1/3 mx-auto">&nbsp;</div>
</div>