I am working with Semantic UI and I am having trouble with their Tabs. The first tab is showing as the active tab, but when you click on the second tab, the tab does not change. You can see their example under "Attached" here. You can see my example below. I believe it is set up correctly. I also set up this JSFiddle with Semantic and jQuery included. Please let me know if you have any questions.
<div class="ui top attached tabular menu">
<a class="active item">One</a>
<a class="item">Two</a>
</div>
<div class="ui bottom attached segment">
<h4>Product Name</h4>
<p>Here is the description</p>
</div>