I have been recently been trying to make a very simple but nice looking page to host a tic-tac-toe game for my up coming science fair as I am in 8th grade.I come across a design when I put an background-image under an background-color as it looks good. When I try to recreate the sinario in my gitlab repo it keeps on doing not what I thought. If you didn't understand by now I am quite a newbie.
If someone could give me a snipit of code or an idea of how to do it it would be appreciated.
I checked all over stack but I can't find a question similar so if it is repeated my appologies.
EDIT:Take out the source code