Update app.py

app.py

@@ -6,12 +6,12 @@ import gradio as gr
 
 dropdown, js = create_theme_dropdown()
 
-with gr.Blocks(theme='gradio/default') as demo:
+with gr.Blocks(theme='Tonic/greenblast-alpha') as demo:
     with gr.Row().style(equal_height=True):
         with gr.Column(scale=10):
             gr.Markdown(
                 """
-                # Theme preview: `a11y-one`
+                # Theme preview: `greenblast`
                 To use this theme, set `theme='Tonic/a11y-one'` in `gr.Blocks()` or `gr.Interface()`.
                 """
             )