try change button style

app.py

@@ -113,11 +113,15 @@ css = """
     margin: 0 auto;
     max-width: 640px;
 }
+button {
+    background-color: #422ad5;
+    outline-color: #422ad5;
+}
 """
 
 # generated_prompt = ""
 
-with gr.Blocks(css=css) as demo:
+with gr.Blocks(css=css, theme=gr.themes.Soft()) as demo:
     # gr.Markdown("# Draptic: from garment image to technical flat sketch")
     with gr.Row():
         with gr.Column(elem_id="col-input-image"):