title: HTML, CSS popup layout
body: <p><a href="https://i.stack.imgur.com/jUNBl.png" rel="nofollow noreferrer">How to set up the css/html code if the A needs to be at the corner of the bottom right- where the red rectangle pointed</a></p>
  
  <p>two things:
  *responsive page
  *background is overlay. the white rectangle is a popup.</p>