Leaflet Panes example using circleMarkers

<!DOCTYPE html>
<html>

<head>
  <title>Leaflet</title>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link type="text/css" rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css" />
  <style>
    html,
    body,
    #leaflet {
      height: 90%
    }
  </style>
</head>

<body>
  <button id="hidem">Hide</button>
  <button id="showm">Show</button>
  <div id="leaflet"></div>
  <script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet-src.js"></script>

  <script>
    var map = L.map('leaflet', {
      layers: [
        L.tileLayer('//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
          'attribution': 'Map data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors'
        })
      ],
      center: [48.85, 2.35],
      zoom: 12
    });

    // Example adapted from http://jsfiddle.net/b7LgG/3/
    // provided by @danzel https://github.com/Leaflet/Leaflet/issues/4#issuecomment-35025365
    // Images from Leaflet Custom Icons tutorial http://leafletjs.com/examples/custom-icons/
    //We don't use shadows as you can't currently specify what pane shadows end up in

    //Create panes for each of the sets of markers
    var pane1 = map.createPane('markers1');
    var pane2 = map.createPane('markers2');

    populate();

    function hide() {
      pane2.style.display = 'none';
    }

    function show() {
      pane2.style.display = '';
    }

    L.DomUtil.get('hidem').onclick = hide;
    L.DomUtil.get('showm').onclick = show;

    //Add 200 markers to each of the groups/layers
    function populate() {
      for (var i = 0; i < 200; i++) {
        L.circleMarker(getRandomLatLng(), {
          pane: 'markers1',
          "radius": 5,
          "fillColor": "#ff7800",
          "color": "#ff7800",
          "weight": 1,
          "opacity": 1
        }).addTo(map);
        L.circleMarker(getRandomLatLng(), {
          pane: 'markers2',
          "radius": 5,
          "fillColor": "#012999",
          "color": "#012999",
          "weight": 1,
          "opacity": 1
        }).addTo(map);
      }
      return false;
    }

    function getRandomLatLng() {
      return [
        48.8 + 0.1 * Math.random(),
        2.25 + 0.2 * Math.random()
      ];
    }
  </script>
</body>

</html>