At the page https://wikipedialibrary.wmflabs.org/terms/ it seems strange (unnecessary, and impeding) to have the limited height box.
I tentatively suggest removing the page source's

<style type="text/css">
  #terms {
    height: 300px;
    border:1px solid #ccc;
    padding:6px;
    overflow:scroll;
  }
</style>

(Feel free to decline if I've overlooked a good rationale for this.)