There is an error in one of the web app templates: "Basic web app project with simple scene":

In the index.html file, one of the class names is mis-spelled:

<div id="stage">
<table id="slider" class="show_toc" cellspacing="0" cellpadding="0" border="0" summary="Slider Table">
<div class="item_containter" id="toc"> <---- should be "item_container"

As a result, this DIV does not pick up the style defined in the CSS