title: Application Menu on top of Leaflet map
body: <p>In a map application based on Leaflet, I would like to have a large application menu, kind of a settings menu. I managed to put a nice button into the top right corner as a L.Control and it gets fired on a click.</p>
  
  <p>The menu should position either to the left of the menu button or simply in the middle of the screen. </p>
  
  <p>I am wondering whether it is best practice to use</p>
  
  <ol>
  <li>a Popup, </li>
  <li>a Layer,</li>
  <li>another Control or </li>
  <li>just position a  at the right place on the page. </li>
  </ol>
  
  <p>Trying the latter, I found that I have to set z-index to a very high value to see it, and it feels a bit odd not to use the Leafleat features.</p>
  
  <p>What would be the "right" solution to use with Leaflet?</p>