Update app.py

app.py

@@ -421,7 +421,7 @@ html, .gradio-container, .dark, .dark * {
   height: 100% !important;
   display: block;
   margin: auto;
-  object-fit: unset;
+  object-fit: contain;
 }
 
 .block.svelte-11xb1hd {
@@ -503,7 +503,7 @@ with gr.Blocks(css=css, theme=gr.themes.Default(font=[gr.themes.GoogleFont("Play
             rand    = gr.Checkbox(True, label="Randomize seed")
         with gr.Row():
             width  = gr.Slider(256, 512, step=32, value=512, label="Width")
-            height = gr.Slider(256, 1024, step=32, value=512, label="Height")
+            height = gr.Slider(256, 768, step=32, value=512, label="Height")
         with gr.Row():
             cfg    = gr.Slider(1.0, 30.0, step=0.5, value=6, label="CFG Scale")
             steps  = gr.Slider(1, 12, step=1, value=12,   label="Steps")