Update app.py

app.py

@@ -161,7 +161,7 @@ ROFORMER_MODELS = {
 OUTPUT_FORMATS = ['wav', 'flac', 'mp3', 'ogg', 'opus', 'm4a', 'aiff', 'ac3']
 
 # CSS (unchanged from provided version)
-css = """
+CSS = """
 body {
     background: linear-gradient(to bottom, rgba(45, 11, 11, 0.9), rgba(0, 0, 0, 0.8)), url('/content/logo.jpg') no-repeat center center fixed;
     background-size: cover;