Hey there,
@alexandra Happy to help ??
@charot_ there could be few reason for that.
It is possible that child theme style.css is not loading properly (you can check by adding anything else there and see if it is working, or this is not the case if you already have some CSS there that is working properly.)
Also if you’re putting this at the top of your child theme style.css and you have the same selector below with different properties so it gets overridden.
Other then that there is a chance that somewhere in your child theme style.css there is a closing bracket missing so the code below is not working.
Hope this helps ??
Cheers,
Bojan