Hi
This is wrong for a start, background: url();
This should be written as: background-image: url();
especially if you are naming other elements of the background. Because all this does is adds the default settings, of which left repeat are the default settings for position and repeat.
Also there is no such CSS Syntax called 'center' for background-size. So not sure where you got that from? Unless you ment 'cover'?
Check this out if you are not sure what I am talking about?
https://www.w3schools.com/cssref/css3_pr_background-size.asp
Cheers
Mary