I'm using reactstrap (based on Bootstrap4) to create a React app. I am trying to create a side-by-side pair of cards (a login and register set) that, when the browser is small, would go one above the other. I can get them centered horizontally, but not vertically. Seems like the container/row/col does not expand to fill the window. How would one go about centering this?
See https://codesandbox.io/s/71r9x2ynwx for a working example.