Updating buttons

app.py

@@ -46,7 +46,7 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
             width_ths = gr.Slider(0, 10, 7.7, 0.1, label="Width Threshold to merge bounding boxes")
             with gr.Row():
                 clear_btn = gr.ClearButton()
-                submit_btn = gr.Button("Submit")
+                submit_btn = gr.Button("Submit", variant='primary')
         with gr.Column():
             ocr_out = gr.Textbox(label="OCR Output", type="text")