title: How can I divide the screen to these divs in css?
body: <p>Just how can I make my page look like this:
  <img src="https://i.stack.imgur.com/JomkW.jpg" alt="enter image description here"></p>
  
  <p>When the left, and right (the upper divs</p>
  
  <p>When A and B's height is unknown (well, the one who has most content will decide on how down below C is)</p>
  
  <p>Thanks in advance</p>