Vertically Align Poster Buttons Using Jaunt Template

Hi there

I've been stuck on this seemingly simple task all morning and I simply can't find an answer anywhere. Maybe I'm missing something, or it's one of those bizarre Squarespace limiations.

I have set up some content blocks for my homepage but the auto vertical alignment of the poster buttons is centered, I wish for them to be at the bottom as all of my images' main focus is the centre. I don't need them in Stack so they appear underneath, but at the bottom of the image so feel Poster style is accurate.

Is it possible to do this? There are no options in Design and I have copied and pasted several CSS codes in with no luck!

Example of the current view below:

Any help would be appreciateds

Thanks
Roxanne