Update app.py

app.py

@@ -37,7 +37,12 @@ with gr.Blocks(
     fill_height=True
 ) as app:
     gr.HTML("<div style='text-align:center;overflow:hidden;'><h2>&#128211; PDF Summarizer &#128211;</h2></div>")
-    with gr.Sidebar(visible=True):
+    with gr.Sidebar(elem_id = "sidebar"):
+        gr.HTML("""
+            <style>
+                #sidebar {background-color:black;}
+            </style>
+        """)
         gr.HTML("<div style='text-align:center;overflow:hidden;'><h3>&#128211; PDF Summarizer &#128211;</h3></div>")
         gr.HTML("<br>")
         # load sweet alert module from cdn