"d-flex justify-content-center" centres everything in the green rectangle. Remove the code and see what happens

4
4
4
4
4
4
5
2
5
2
8
2
12
8
2
HELLO - delete "row" to have this align properly

fade

Where the below all comes from
fade down
fade right
fade left
fade up right
fade up left
fade down right
fade down left

flip

flip up
flip down
flip right
flip left

slide

slide up
slide down
slide right
slide left

zoom

zoom in
zoom out
zoom in up
zoom in down
zoom in left
zoom in right
zoom out up
zoom out down
zoom out left
zoom out right
zoom out right