Partners Widget Animation

I am using the Partners Widget, but the animation shown in the current demo is not appearing. The forward and backward arrows to navigate through the content are not available.

I believe it is controlled by the lines of code:
<button type=”button” class=”slick-prev partners-prev” style=”display: block;”><i class=”fa fa-angle-left”></i></button>
<button type=”button” class=”slick-next partners-next” style=”display: block;”><i class=”fa fa-angle-right”></i></button>