Theme is only support G5, G6, V20, V30 and Oreo only. Please reboot your phone after apply theme.
The default background color of the notification is black, in some cases due to the settings of the third-party application so the message will be dark on the black background. In case you can't accept that, you can restore the default message to the white background by installing patches (get it on http://bit.ly/2SIi6XG )
Feedback to me if you have problem or bugs in my group with screenshots:
To get theme, please go to my website.
Google plus: https://plus.google.com/communities/111709234518916948036
Email : email@example.com