>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3396147. --> Reported by: [francismak](https://www.drupal.org/user/550378) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Fullscreen mode not working when using claro theme with vertical tab</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>- install drupal 10, using default claro theme<br> - install module admin_toolbar<br> - create content type, with form display widget 'Tabs', direction 'Vertical'</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>The CSS(web/core/themes/claro/css/components/vertical-tabs.css) of parent wrapper(.vertical-tabs__panes) for vertical tabs has a z-index: 1; Although the fullscreen has fixed position and z-index higher than the admin toolbar, the HTML node is under the vertical tabs wrapper.</p> <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>