title: Shadow in graphviz
body: <p>I want draw in plantuml MVC diagram, but shadow is not work as I want.</p>
  
  <pre><code>@startuml
  digraph G {
  node[shape=box, style=rounded, shadow_offset=7, shadow_blur=5];Model;View;Controller
      View -&gt; Model
      Controller -&gt; View
      Controller -&gt; Model
  }
  @enduml
  </code></pre>
  
  <p>I want to draw
  <a href="https://i.stack.imgur.com/eieWA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eieWA.png" alt="enter image description here"></a></p>