I think I’m getting closer to what you want now 
Have a look at this and then let me know what other requirements you have for it. This is just a basic 2 column with no heights required anywhere.
Click on the Edit on Codepen text to see it full screen,
Have a play around and then we can tweak to suit your purpose a little more. You can just fork the codepen and play around with it. (Codepen is great for demos and is free for the basic version.)