Can't seem to pin stack view to bottom and edges of view correctly

I have what I thought was a simple setup with stack views. Two stacks with four buttons equally spaced in each which are contained in a third stack view that is positioned at the bottom of the primary view.

When changing the display size (from say 7 to ipad to down to 6s) the stacks move all over the place. I have tried about every combination I know setting the main stack to leading space to container margin, trailing space to container margin, vertical spacing to top and bottom but nothing seems to keep it position right where I want it.

As an FYI, I have an image view that is positioned to cover the entire primary view and its above the stack views, but that seems to working in resizing itself correctly.

Suggestions on where to go from here? I’m at my wits end with this LOL

Hi @dpalme

Do you have any errors in your storyboard?
As far as i understand you need to pin stack view with a fixed height to the bottom. If this is true, you don’t need to set the top spacing constraint, you need: leading, trailing, height, bottom.