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AdminLTE4's bundled Bootstrap 5 CSS sets --bs-form-select-bg-img (the chevron background image on .form-select) to an inline data: URI SVG, which FTL's img-src 'self' CSP silently blocks. DataTables' Bootstrap 5 integration adds .form-select to its own "entries per page" <select> on every table it builds, so this hit every DataTables-driven page (query log, DHCP leases, DNS/CNAME record tables, group tables, etc.) even though no template in this repo uses .form-select directly. Re-host the light- and dark-theme arrow icons as local files and point the custom property at them, same approach as the existing checkbox/ radio/close-button fixes. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Signed-off-by: Adam Warner <me@adamwarner.co.uk>