title: Use a template image in Shiny
body: <p>I'm looking for a way in Shiny to allow a user to change the values for (a) and (d) and update the rest of the confusion matrix. The key is that I'd like the text and numbers to appear in this visual format. Is there any way to use a template image and overlay objects that get updated dynamically? A better approach?  </p>
  
  <p>We have <a href="https://globalhealthresearch.shinyapps.io/confusion-matrix/" rel="nofollow noreferrer">this so far</a>, but the layout is not ideal. </p>
  
  <p><a href="https://globalhealthresearch.shinyapps.io/confusion-matrix/" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1CwLj.png" alt="enter image description here"></a></p>