Update app.py

app.py

@@ -240,6 +240,12 @@ h1 {
   text-align: center;
   display: block;
 }
+.submit-btn {
+    background-color: #2980b9 !important;
+    color: white !important;
+}
+.submit-btn:hover {
+    background-color: #3498db !important;
 """
 
 title = """<h1 align="center">Diffusers Image Outpaint Lightning</h1>
@@ -260,7 +266,7 @@ with gr.Blocks(theme=gr.themes.Soft(), css=css) as demo:
                     with gr.Column(scale=2):
                         prompt_input = gr.Textbox(label="Prompt (Optional)")
                     with gr.Column(scale=1):
-                        run_button = gr.Button("Generate Image / Diffusers Outpaint Image Lightning {Lightning v4, v5}")
+                        run_button = gr.Button("Generate Image / Diffusers Outpaint Image Lightning {Lightning v4, v5}", elem_classes="submit-btn")
                         
                 with gr.Row():
                     model_selector = gr.Dropdown(