Update max-width in app.py from 1100px to 900px to further enhance layout responsiveness and improve UI presentation.

app.py

@@ -190,7 +190,7 @@ examples = []
 css = """
 #col-container {
     margin: 0 auto;
-    max-width: 1100px;
+    max-width: 900px;
 }
 #logo-title {
     text-align: center;