leaflet.com providers code example
Example: leaflet dark mode
var Stadia_AlidadeSmoothDark = L.tileLayer('https://tiles.stadiamaps.com/tiles/alidade_smooth_dark/{z}/{x}/{y}{r}.png', {
maxZoom: 20,
attribution: '© <a href="https://stadiamaps.com/">Stadia Maps</a>, © <a href="https://openmaptiles.org/">OpenMapTiles</a> © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors'
});