How to vertically align Bootstrap v4 modal dialogs

Question

Vertically center modal dialogues in Bootstrap 4.

Note: The requirements below have been added to make it clear I am looking for a prop

Answer 1

Simply add modal-dialog-centered class along with model-dialog as below

  
  
  
  

 Launch Modal     

    

        

            

                
Modal Title
                ×
            
            
Lorem Ipsum is simply dummy text of the                        printing and typesetting industry
 
            

                Close