RapidWeaver Stacks add-on info:
The main purpose of the Stack is to make it fast and simple to align text, but there's so much more to this stack. It's a stack you'll probably use in every project once you've learned how easy it is to work with.
Drag, click, adjust and you' good to go.
Most of the black boxes around this site is created with the AlignText Stack.
RapidWeaver, stacks, responsive, free stack.