Dropdown Search not working - missing scripts?

I am trying to implement the dropdown search feature from the UiKit, but am having trouble displaying the search bar itself. I have added only the scripts I need this far in my application, maybe I am missing one? Can anyone see what it is I'm missing

Dropdown Search UIKit

Here's my codepen:

Codepen example

<nav class="uk-navbar uk-navbar-container uk-margin">
<div class="uk-navbar-left">

    <a class="uk-navbar-item uk-logo" href="#">Logo</a>

    <ul class="uk-navbar-nav">
        <li class="uk-active"><a href="#">Active</a></li>
        <li><a href="#">Item</a></li>
    </ul>

</div>
<div class="uk-navbar-right">

    <a class="uk-navbar-toggle" href="#modal-full" uk-search-icon uk-toggle></a>

</div>