Update app.py

app.py

@@ -107,6 +107,14 @@ class GradioInterface:
     background-color: #e3f2fd !important;
 }
 */
+.gradio-container > div:first-child {
+    background-image: url('file=prompt_plus_plus.jpg');
+    background-size: cover;
+    background-position: center;
+    background-repeat: no-repeat;
+    background-color: rgba(255, 255, 255, 0.25);
+    background-blend-mode: overlay;
+}
 .container {
     border: 2px solid #2196F3;
     border-radius: 10px;