#pdfViewerLoadingOverlay {
    position: fixed;
    inset: 0;
    z-index: 100000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: .75rem;
    background: #fafafa;
}

#pdfViewerLoadingOverlay.pdf-viewer-loading-overlay-hidden {
    display: none;
}

#pdfViewerLoadingOverlay .pdf-viewer-loading-spinner {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: .35em solid #cfe2ff;
    border-top-color: #0d6efd;
    animation: pdf-viewer-loading-spin 0.75s linear infinite;
}

@keyframes pdf-viewer-loading-spin {
    to {
        transform: rotate(360deg);
    }
}