I'm doing a bootstrap 4 course, the teacher uses and teaches that there is flex-items
class for alignment, to align vertically for example, we could use something like this:
flex-items-md-middle
The problem with me does not work, at the time of class, bootstrap 4 was still in beta, I do not know if they could have changed this class. In the bootstrap site I did not find any reference about it, did it change?