Have you tried using the overlay EFFECT DIM 60 for this background?
It should give a “night effect”
i tried it, it sill looks like day
Also, be careful when you’re using images that you’re getting from online. You can run into Copyright problems. Make sure you get permission and view the requirements, as well as the license for how you can use the image within your story and how to give proper credit.
In your case, that image comes from:
Cause I was like, wait where this background came from, I know I saw this somewhere.