These type of cards are so fun to make & super quick & easy.
U start with the normal A2 size, (5.5 x 4.25) cut the 1st layer (black) at 5.25 x 4, then I make the white just slightly smaller then the 2nd black layer is 4.75 x 3.5 then again layered the white just a tiny bit smaller & lastly the 3rd black layer is 4.25 x 3 & again the same idea with the white.
Layer the 3 whites together DO NOT GLUE!! Stamp the image u want.
Then color if needed, once that's done layer the white & black together, add ribbon if desired. I like to add pop dots to the smallest layer, it really gives it a cool 3d look.