Improve hierarchical dropdown with a better appearance
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3508891. -->
Reported by: [gxleano](https://www.drupal.org/user/3591999)
Related to !134 !174
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The hierarchical dropdown doesn't look so nice.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Improve the look and feel of hierarchical dropdown.</p>
issue