Hello,
Looking at some bootstrap 4 examples I see a lot of classes, which looks
like predefined(especially flex classes), like :
flex w-full justify-content-center
If yes, please, provide a link when they are described…
Thanks!
From a quick serch: 
https://www.tutorialmines.net/bootstrap-classes/
https://www.w3schools.com/bootstrap4/bootstrap_ref_all_classes.asp
https://bootstrapcreative.com/resources/bootstrap-4-css-classes-index/
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… and from the horses mouth 
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