Update app.py

Please let us make 1024 height and width

app.py

@@ -578,10 +578,10 @@ with gr.Blocks(css=css) as demo:
 
                     with gr.Row():
                         width = gr.Slider(
-                            label="Width", value=512, minimum=64, maximum=768, step=64
+                            label="Width", value=512, minimum=64, maximum=1024, step=64
                         )
                         height = gr.Slider(
-                            label="Height", value=512, minimum=64, maximum=768, step=64
+                            label="Height", value=512, minimum=64, maximum=1024, step=64
                         )
 
                     sampler = gr.Dropdown(