Hi, it seems there is an unnecessary closing div element here (.wrap CSS class)
index.php (updater folder)
<div class="outer">
<button class="info-footer" id="button">
<div id="arrowdown"></div>
</button>
<div class="inner">
<div id="wrap">
(…)
</div>
</div>
</div><!-- .inner -->
</div><!-- .outer -->
it should be
</div>
</div><!-- .inner -->
</div><!-- .outer -->