Update app.py

app.py

@@ -179,7 +179,7 @@ stream = Stream(
 )
 
 css = """
-#video-source {max-width: 500px !important; max-height: 500px !important; background-color: #111111 }
+#video-source {max-width: 500px !important; max-height: 500px !important; background-color: #0b0f19 }
 #video-source video {
     background-color: black !important;
 }