Remove the minimum height set on each text element. It will then give you equal height for columns but the button is still not aligned at the bottom. To achieve that we can use custom CSS. We will position it on the bottom of the column. First add,
position: relative; on each column style field. Then on each button style field add
position: absolute; bottom: 0; Result will be something like this:
To understand CSS positioning better, please check this:https://www.w3schools.com/css/css_positioning.asp
Hope this helps.