Leaflet Map Coloring Map

https://stackoverflow.com/q/60428521/8283938

by jharris711

HTML

<!DOCTYPE html>
<html>
<head>
	
	<title>Quick Start - Leaflet</title>

	<meta charset="utf-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	
	<link rel="shortcut icon" type="image/x-icon" href="docs/images/favicon.ico" />

    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.6.0/dist/leaflet.css" integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ==" crossorigin=""/>
    <script src="https://unpkg.com/leaflet@1.6.0/dist/leaflet.js" integrity="sha512-gZwIG9x3wUXg2hdXF6+rVkLF/0Vi9U8D2Ntg4Ga5I5BZpVkVxlJWbSQtXPSiUTtC0TjtGOmxa1AJPuV0CPthew==" crossorigin=""></script>

	
</head>
<body>



<div id="mapid" style="width: 600px; height: 400px;"></div>

</body>
</html>

CSS

/* Adjust this to adjust brightness without altering markers */
.leaflet-tile {
    filter: brightness(50%) !important;
}

JavaScript

var mymap = L.map('mapid').setView([51.505, -0.09], 13);

	L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
		maxZoom: 18,
		attribution: 'Map data &copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, ' +
			'<a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
			'Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
		id: 'mapbox.streets'
	}).addTo(mymap);

	var marker = L.marker([51.5, -0.09]).addTo(mymap)
		.bindPopup("<b>Hello world!</b><br />I am a popup.").openPopup();

	var circle = L.circle([51.508, -0.11], 500, {
		color: 'red',
		fillColor: '#f03',
		fillOpacity: 0.5
	}).addTo(mymap).bindPopup("I am a circle.");

	var poly = L.polygon([
		[51.509, -0.08],
		[51.503, -0.06],
		[51.51, -0.047]
	]).addTo(mymap).bindPopup("I am a polygon.");