title: size of node with shape=circle
body: <p>i'm trying to set the size of the nodes this way:</p>
  
  <pre><code>controller[shape=circle,width=.5,label="Controller",style=filled,fillcolor="#8EC13A"];
  </code></pre>
  
  <p>But all three nodes are with different size. How can i set fixed size?</p>