Sticking Modal close button to bottom?

This should be so simple but I can’t see how to do this.

I have a series of modals that give extra info about things in the app, and I’d like the modal buttons to be at the bottom of the modal. The info will never be large enough to fill the modal.

How do I do it?!

Note: You can put the button in an ionic footer but it’s a different size to the normal modal button and doesn’t follow the button CSS rules.