Update app.py

app.py

@@ -18,8 +18,8 @@ with gr.Blocks(
     css=".contain { display: flex !important; flex-direction: column !important; }"
     "#chatbot { flex-grow: 1 !important; overflow: auto !important;}"
     "#col { height: calc(100vh - 112px - 16px) !important; }"
-    "#submit { cursor: pointer; "
-    ":hover {background-color: green !important;} }",
+    "#submit { cursor: pointer !important; "
+    "#submit:hover {background-color: green !important;} }",
     theme=gr.themes.Soft(font=[gr.themes.GoogleFont("Martel Sans")])                   
 ) as demo:
     gr.Markdown("# GPT4All Chatbot")