Step1: Align elements within your design, then GROUP
Step2: GROUP objects that are "one object" (Ctrl - G)
Step 4: Align all GROUPS in the middle VERTICALLY.
Click on one object to anchor it (does not move).
Then GROUP (again).
Step 5: Align your design & background box to ARTBOARD.
Then GROUP (again).
When using the ALIGN toolbar, pay attention to each BOUNDING BOX!
( Below does NOT work! )
It is best if you first CREATE OUTLINES for all text!