Css flexbox , try to keep chat in view : i'm tired with css flexbox, i want to implement a chat which stays in screen with a sticky footer. But i'm really stuck. [Something like that][1]
Or at least , have the bottom of my chat at the bottom of the content or screen.
I'm using bootstrap 4.1.
If anyone have an idea, that would be very helpfull
  [1]: https://i.stack.imgur.com/ovwxK.png