html5 – Image from CSS

I want to upload an image to a label img from a css file

The following code is from my HTML

Online store

and then the CSS

img.logo-header {background: url ("../img/centro.jpg");}

my file folders are structured in this way

enter the description of the image here

I can not get the image charged, I do not know if I'm doing something wrong or
I must upload the page to a hostinger and place the image in this way

img.logo-header {background: url ("");}

There are more rules in my CSS file, it is ruled out that it is not correctly connected to the style sheet.