The biggest problem that people face while suing CSS libraries is with keeping in mind the classnames, so we simplified it. e.g., if you need a red background, just write the class.bg-red
and it will make the background of that element red irrespective of what it is.
Naming of classes has been done carefully. So that keeping in mind the class names do not come as a new and hard task. Once you start using it. It will start coming to you naturally. 😊