fix: test bg in gradio container

css/style.css

@@ -1,5 +1,5 @@
 .gradio-container {
-    background: url('file=medias/bg_clear.png');
+    background: url('https://storage.googleapis.com/wpassets.junyiacademy.org/1/2023/11/background-scaled.jpg');
     background-size: cover;
     background-position: center center;
     background-repeat: no-repeat;