Update app.py

app.py

@@ -256,7 +256,14 @@ def sysml_chatbot(message, history):
         return answer, history
 
 # Gradio UI
-with gr.Blocks() as demo:
+with gr.Blocks(css="""
+    #submit-btn {
+        height: 100%;
+        background-color: #48CAE4;
+        color: white;
+        font-size: 1.5em;
+    }
+""") as demo:
     
     gr.Markdown("## SysModeler Chatbot")