I learned that codepen doesn't create a new save if you change the file name and save again... So I can only share where I started a new pen. :sadface:
Nested div 2 in div 1. Div 1 had position: relative. div 2 used position absolute. I subtracted half of div 1 height and width by half of div 2 height and width to get the positioning for the center, so then set top: 75px and left: 75px on div 2.
Nested div 2 and 3 within div 1. I floated 2 and 3 left and right respectively with 50px margin, and translatedY 25%.