fix(make submit button primary varient)

app.py

@@ -223,7 +223,7 @@ with gr.Blocks(theme=gr.themes.Default(font=[gr.themes.GoogleFont("Plus Jakarta
                 answer = gr.Textbox(label="Answer")
             with gr.Row():
                 clear_btn = gr.ClearButton([question, document, answer])
-                submit_button = gr.Button("Submit")
+                submit_button = gr.Button("Submit", variant="primary")
         with gr.Column(scale=1):
             reasoning = gr.Textbox(label="Reasoning")
             score = gr.Textbox(label="Score (FAIL if Hallucinated, PASS if not)")