Change variant to panel for Columns and Rows, otherwise not visible

app.py

@@ -35,18 +35,18 @@ def main():
             visit [Balacoon website](https://balacoon.com/) for more info.
             """
         )
-        with gr.Row():
+        with gr.Row(variant="panel"):
             text = gr.Textbox(label="Text", placeholder="Type something here...")
 
         with gr.Row():
-            with gr.Column():
+            with gr.Column(variant="panel"):
                 repo_files = list_repo_files(repo_id="balacoon/tts")
                 model_files = [x for x in repo_files if x.endswith(".addon")]
                 model_name = gr.Dropdown(
                     label="Model",
                     choices=model_files,
                 )
-            with gr.Column():
+            with gr.Column(variant="panel"):
                 speaker = gr.Dropdown(label="Speaker", choices=[])
 
             def set_model(model_name_str: str):
@@ -73,9 +73,9 @@ def main():
 
             model_name.change(set_model, inputs=model_name, outputs=speaker)
 
-        with gr.Row():
+        with gr.Row(variant="panel"):
             generate = gr.Button("Generate")
-        with gr.Row():
+        with gr.Row(variant="panel"):
             audio = gr.Audio()
 
         def synthesize_audio(text_str: str, speaker_str: str = ""):