To ensure the .chips element is displayed properly, create a parent element and adjust the height of the scrollable section accordingly.
Next, specify the height of the .chips element to allow visibility for dropdowns.
<div class="content-wrapper" style="height: 47px;>
<div class="chips" style="height: 62px;>
<div class="chip large">
<input type="text" placeholder="Search">
</div>
<div class="chip select">
<button type="button">click</button>
<div class="dropdown active">
a whole bunch of visible content
</div>
</div>
<a class="chip large">Blog</a>
<a class="chip large">In the news</a>
<a class="chip large">Press releases</a>
<a class="chip large">Case studies</a>
<a class="chip large">Video</a>
</div>
</div>
Additionally, remember to set the z-index for .dropdown in order to make it visible.
I have provided a working example on my end here