<div class="under-construction"
     style="width: <%= MemeCaptainWeb::Config::THUMB_SIDE %>px; height: <%= MemeCaptainWeb::Config::THUMB_SIDE %>px;">
  <p>Under Construction</p>
</div>

<div class="under-construction">
  <p>Under Construction</p>
</div>

Remove width and height from under construction div.
Remove width and height from under construction div.

This will make it scale correctly on mobile.
