Thanks for your answer!
So basically you are saying that in my child-theme’s functions.php I need to override the whole function catchbase_content_width() and not just $content_width var ?
Just to understand what is going on, is this necessary because $content_width in my child-theme functions.php will be overwritten when catchbase_content_width() is called, meaning that that function is called after my $content_width = x ?
Is there something else to it? Something else is different in the function?
Thanks a lot!