Update app.py

app.py

@@ -137,7 +137,7 @@ def display_iframe():
 def display_image():
     return "https://huggingface.co/spaces/dogutcu/composting-how-tos/resolve/main/derinogutcu-illo1.jpg"
 theme = gr.themes.Monochrome(
-    primary_hue="#lime",
+    primary_hue="lime",
     secondary_hue="red",
 ).set(
     background_fill_primary='*#e0f7fa',