var zone_a = L.polygon([
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], {
  color: "green",
  fillColor: "#3ef06e",
  fillOpacity: 0.3
});

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]);

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  fillColor: "#ffeb0a",
  fillOpacity: 0.3
});

function initMap(event) {
  var map = L.map('map', {
    maxZoom: 18,
    minZoom: 10,
    maxBounds: L.latLngBounds(L.latLng(47.3770, 11.2025), L.latLng(47.1770, 11.7025)),
    maxBoundsViscosity: 1,
    scrollWheelZoom: false
  }).setView([47.2770, 11.4525], 12);

  L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
  }).addTo(map);

  //Adding Zones in prefered order, to ensure correct coloring of borders
  zone_c.addTo(map);
  zone_a.addTo(map);
  zone_b_1.addTo(map);
  zone_b_2.addTo(map);
}

if (document.getElementById("map") != null) {
  initMap(null);
} else {
  window.addEventListener("DOMContentLoaded", initMap);
}