Update style.css

style.css

@@ -4,13 +4,15 @@
   box-sizing: border-box;
   font-family: sans-serif;
 }
+gradio-app {
+  background-color: #121212 !important;
+  background-image: url("file=assets/bg.png") !important;
+  background-size: cover !important;
+}
 #component-0 {
   padding: 5% 5% 0% 5%;
   display: flex;
   flex-direction: column;
-  background-color: #121212;
-  background-image: url("file=assets/bg.png");
-  background-size: cover;
 }
 #header_block {
   display: flex;