title: Leaflet - modal opens behind map
body: <p>I'm using <code>leaflet</code> and <a href="https://github.com/pedrolaxe/modalcss" rel="nofollow noreferrer">modalcss</a> to display a modal within a map.
  This worked like a charm with <code>leaflet</code> v0.7.7. See this Plunker: <a href="http://plnkr.co/edit/logpfGtVXrv9JUtEGDrF?p=preview" rel="nofollow noreferrer">click</a>
  --> Click the button under the zoom controls.</p>
  
  <p>When I switch to <code>leaflet</code> v1.2.0 the modal gets opened but behind the map. See this Plunker: <a href="http://plnkr.co/edit/R85hZ2mNU9cCAeakGcu9?p=preview" rel="nofollow noreferrer">click</a></p>
  
  <p>Why is this happening?
  Any idea on how to show the modal in front of the map like in the old version of <code>leaflet</code>?
  Thanks!</p>