Update app.py

app.py

@@ -1,6 +1,7 @@
 import gradio as gr
 from prompt_refiner import PromptRefiner
-from variables import models, explanation_markdown, custom_css
+from variables import models, explanation_markdown
+from custom_css import custom_css
 
 class GradioInterface:
     def __init__(self, prompt_refiner: PromptRefiner, custom_css):