admin_body_class

Filters the CSS classes for the body tag in the admin. This filter differs from the {@see 'post_class'} and {@see 'body_class'} filters in two important ways: 1. `$classes` is a space-separated string of class names instead of an array. 2. Not all core admin classes are filterable, notably: wp-admin, wp-core-ui, and no-js cannot be removed.