The Center Stack... does exactly that — centers your content on the screen when viewed on a computer, tablet or smartphone.
DeFliGraThe Center Stack will align your images, text & other stacks in the middle of the screen according to viewport width & height, meaning it will center your content when viewed on a computer screen, a tablet or smartphone.
The Stack is created with Landing Pages in mind, but will proof it worth in many situations — works with Safari, Google Chrome, Explorer version 9/9+
As a nice little extra touch you can turn on image fade-in.
Version 1.0.1
Released Feb 25th, 2015