Update app.py

app.py

@@ -126,11 +126,12 @@ examples = [
 
 
 css = """
-#app-container {
+app-container {
+    background: url(https://files.123freevectors.com/wp-content/original/121381-abstract-light-grey-texture-background-image.jpg)
     max-width: 930px;
     margin-left: auto;
     margin-right: auto;
-    ".gradio-container {background: url(https://files.123freevectors.com/wp-content/original/121381-abstract-light-grey-texture-background-image.jpg)}"
+    ".gradio-container {}"
 }
 """