[a11y] Toolbar icons not visible in forced colors / high contrast mode
>>> [!note] Migrated issue
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<!-- Migrated from issue #3373294. -->
Reported by: [bnjmnm](https://www.drupal.org/user/2369194)
Related to !269 !289
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>As seen here toolbar icons are not visible in forced colors mode<br>
<img src="https://www.drupal.org/files/issues/2023-07-07/icons-head.png" alt="" width="450"></p>
<p>The "close" arrow is somewhat visible, but the contrast is quite low and effectively not visible either</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