Update app.py

app.py

@@ -74,7 +74,7 @@ def generate(
     guidance_scale: float = 7.0,
     num_inference_steps: int = 28,
     sampler: str = "Euler a",
-    aspect_ratio_selector: str = "896 x 1152",
+    aspect_ratio_selector: str = "512 x 768",
     style_selector: str = "(None)",
     quality_selector: str = "Standard v3.1",
     use_upscaler: bool = False,