set default dimension

app.py

@@ -52,7 +52,13 @@ iface = gr.Interface(
         gr.components.Textbox(value="", label="Logo Url"),
         gr.components.Textbox(placeholder="Heading text (not required)", label="Heading Text"),
         gr.components.Textbox(placeholder="Paragraph text (not required)", label="Sub Heading Text"),
-        gr.components.Textbox(value="375x667", label="Image Dimension"),
+        gr.components.Dropdown(
+            choices=[
+                ("Mobile Portrait (750x1334)", "750x1334")
+            ],
+            default="750x1334",
+            label="Image Dimension"
+        ),
         gr.components.Textbox(lines=4, placeholder="Enter your custom dall-e 2 image prompt here (not required)", value="", label="Custom Graphic Prompt")
     ],
     outputs=[