Add custom fog to a map | Mapbox GL JS

This example uses setFog to add a fog effect to a map. It also transitions between night and day to change the mood of the environment.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Add custom fog to a map</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.11.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.11.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
(async () => {
const map = new mapboxgl.Map({
container: 'map',
zoom: 13,
center: [6.6301, 45.35625],
pitch: 80,
bearing: 160,
interactive: false,
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio
style: 'mapbox://styles/mapbox/satellite-v9'
});
 
await map.once('load');
 
// Add daytime fog
map.setFog({
'range': [-1, 2],
'horizon-blend': 0.3,
'color': 'white',
'high-color': '#add8e6',
'space-color': '#d8f2ff',
'star-intensity': 0.0
});
 
// Add some 3D terrain
map.addSource('mapbox-dem', {
'type': 'raster-dem',
'url': 'mapbox://mapbox.terrain-rgb',
'tileSize': 512,
'maxzoom': 14
});
map.setTerrain({
'source': 'mapbox-dem',
'exaggeration': 1.5
});
 
// Run a timing loop to switch between day and night
await map.once('idle');
let lastTime = 0.0;
let animationTime = 0.0;
let cycleTime = 0.0;
let night = true;
 
const initialBearing = map.getBearing();
 
function frame(time) {
const elapsedTime = (time - lastTime) / 1000.0;
 
animationTime += elapsedTime;
cycleTime += elapsedTime;
 
if (cycleTime >= 10.0) {
if (night) {
// night fog styling
map.setFog({
'range': [-1, 2],
'horizon-blend': 0.3,
'color': '#242B4B',
'high-color': '#161B36',
'space-color': '#0B1026',
'star-intensity': 0.8
});
} else {
// day fog styling
map.setFog({
'range': [-1, 2],
'horizon-blend': 0.3,
'color': 'white',
'high-color': '#add8e6',
'space-color': '#d8f2ff',
'star-intensity': 0.0
});
}
 
night = !night;
cycleTime = 0.0;
}
 
const rotation = initialBearing + animationTime * 2.0;
map.setBearing(rotation % 360);
 
lastTime = time;
 
window.requestAnimationFrame(frame);
}
 
window.requestAnimationFrame(frame);
})();
</script>
 
</body>
</html>