style(space): add vertical space between widgets

app.py

@@ -37,11 +37,13 @@ with gr.Blocks(css_paths=['layout.css']) as demo:
     with gr.Row():
         with gr.Column():
             source_image = gr.Image(type="pil", label="Source Image")
-            gr.HTML('<br><br>')
+            gr.HTML('<br>')
             reference_image = gr.Image(type="pil", label="Reference Colors")
         with gr.Column():
             result_image = gr.Image(type="pil", label="Resulting Image", format="png")
+            gr.HTML('<br>')
             method_dropdown = gr.Dropdown(choices=transfer_methods, label="Transfer Method", value='hm-mkl-hm')
+            gr.HTML('<br>')
             submit_button = gr.Button("Transfer Colors")
 
     submit_button.click(