Style class associated for the style named "Card" (per your screenshot) in component policy is added without "." - It is just the CSS class name as defined in your project specific clientlibs (as highlighted in below screenshot)
Project specific clientlibs is loaded (In particular, style for the class you have used)
As an immediate step, inspect the component and check if class name is applied on the desired element (as evident from Network -> Elements Tab) and hence its CSS properties
Style class associated for the style named "Card" (per your screenshot) in component policy is added without "." - It is just the CSS class name as defined in your project specific clientlibs (as highlighted in below screenshot)
Project specific clientlibs is loaded (In particular, style for the class you have used)
As an immediate step, inspect the component and check if class name is applied on the desired element (as evident from Network -> Elements Tab) and hence its CSS properties