A
A.Empty 20px abovethe inner margin, empty 30px below, empty 40px around.
B
B.Empty 20px aboveinner margin, empty 30px around, empty 40px below
C
C.The outer edge is20px above and 30px below, and both sides are 40px
D
D.The outer edge isabout 20px away from the upper space, 30px away from the upper spaceand 40px away from the lower space.
