Different sitewide banners on specific pages for child theme virtue

Hi, I want to put different sidewide banners for my product category pages and blog. I’m using child theme and already copied templates/header.php. I tried to put these two options on Custom CSS, but NONE of them works:

1)
.page-id-6 .virtue_banner {
background: url (https://quangducstore.com/wp-content/uploads/2016/04/1456396288261688826936541.jpg);
}

2)
.page-id-6 .headerclass {
background: url (https://quangducstore.com/wp-content/uploads/2016/04/1456396288261688826936541.jpg);
}
Any help please?