Use green theme

app.py

@@ -63,8 +63,11 @@ def start_ml_worker(url, api_key, hf_token):
     thread.start()
     return f"ML worker running for {url}"
 
+theme = gr.themes.Soft(
+    primary_hue="green",
+)
 
-with gr.Blocks() as iface:
+with gr.Blocks(theme=theme) as iface:
     with gr.Row():
         with gr.Column():
             url_input = gr.Textbox(label="Giskard Hub URL")
@@ -73,10 +76,10 @@ with gr.Blocks() as iface:
 
         output = gr.Textbox(label="Status")
     with gr.Row():
-        run_btn = gr.Button("Run")
+        run_btn = gr.Button("Run", variant="primary")
         run_btn.click(start_ml_worker, [url_input, api_key_input, hf_token_input], output)
 
-        stop_btn = gr.Button("Stop")
+        stop_btn = gr.Button("Stop", variant="stop")
         stop_btn.click(stop_ml_worker, None, output)
 
     logs = gr.Textbox(label="Giskard ML worker log:")