Mobile first site built with flexbox and @media breakpoints

My 'learn more' buttons can get out of alignment, at medium and large screens, due to flexbox scaling my text. Each card has a different amount of text, most notably the middle column(in medium or large screens). Thus the middle button gets out of alignment compared to the other two. Is there a quick fix where I can force the button to the bottom of the card and add margin to the bottom for consistent button alignment?