title: How to set background image which will be zoom and drag?
body: <p>I want to create a map with some nodes. Adding nodes works great but setting the background image does not. The docs don't describe, how to add something besides nodes and edges.</p>
  
  <p>Then I tried to add the map as a background image of a node like [this](
  <a href="https://codesandbox.io/s/thirsty-hamilton-wqyvn" rel="nofollow noreferrer">https://codesandbox.io/s/thirsty-hamilton-wqyvn</a>)</p>
  
  <p>This solution has some problems:</p>
  
  <ol>
  <li>The edge is under the node. The docs say, that edges will be always under nodes. Z-index don't resolve the problem.</li>
  <li>The map node has a border which I don't need. </li>
  <li>If I try to zoom when my mouse is on the map node, zooming does not work and dragging neither.</li>
  </ol>