Update app.py

app.py

@@ -281,10 +281,11 @@ def image_processing(image, filter_type):
         
     return cv2.cvtColor(output, cv2.COLOR_BGR2RGB) if len(output.shape) == 3 else output
     
-
 css = """
-.gradio-container {
-    background: url(https://upload.wikimedia.org/wikipedia/commons/4/49/Abstract_-_Coconut_Leaf_%28Imagicity_186%29.jpg)
+app-container {
+    max-width: 1200px;
+    margin-left: auto;
+    margin-right: auto;
 }
 """