[a11y] Dropbutton issues in forced colors mode
>>> [!note] Migrated issue
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<!-- Migrated from issue #3374194. -->
Reported by: [bnjmnm](https://www.drupal.org/user/2369194)
Related to !278
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p><img src="https://www.drupal.org/files/issues/2023-07-12/dropbutton-before.png" alt="" width="300"></p>
<p>As pictured here: In forced colors mode, dropbutton borders look weird and the chevron is basically missing.</p>
<p>In addition, when the dropbutton is open, there is nothing to distinguish the items from the background, and there is no hover or focus effect.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
issue