Update app.py

app.py

@@ -389,7 +389,7 @@ def create_gradio_interface():
         ],
         title="🔬 Academic Paper Batch Downloader",
         description="Upload a BibTeX file or enter DOIs to download PDFs. We'll attempt to fetch PDFs from multiple sources like Sci-Hub, Libgen, Google Scholar and Crossref. You can use any of the three inputs at any moment.",
-        theme="Respair/Shiki@1.2.1",
+        theme="gstaff/sketch",
         examples=[
             ["example.bib", None, None], # Bibtex File
             [None, "10.1038/nature12373", None], # Single DOI