title: Full-screen CSS frame for all resolutions, no matter the content
body: <p>I am trying to achieve something. Lets take for example I have a div inside the body, or body itself, and I give it a border with some margin and I give it a 100% width and height, but since I need content for it to stretch downwards.. </p>
  
  <p>So I have something like this:</p>
  
  <p><img src="https://i.stack.imgur.com/N2KaW.png" alt="Div with full with and small height"></p>
  
  <p>And this is how I want it to be on every resolution, no matter of the content in it:</p>
  
  <p><img src="https://i.stack.imgur.com/xDoyU.png" alt="Fullscreen div"></p>
  
  <p>How do I achieve this?</p>