/* The vendor appends its app into the mount instead of clearing it, so the
   no-JS fallback link has to be hidden once the viewer has actually booted.
   .pf-app is set by the vendor at app creation, not at parse time, so a PDF
   that never loads leaves the link visible. */
._pdfflip_book.pf-app .pdf-flipbook-fallback {
    display: none;
}