Update app.py

app.py

@@ -7,7 +7,7 @@ css = """
     position: relative;
     width: 100%;
     height: 0;
-    padding-bottom: 0%; /* or 56.25% for 16:9 aspect ratio */
+    padding-bottom: 100%; /* or 56.25% for 16:9 aspect ratio */
 }
 .iframe-container iframe {
     position: absolute;