<div id="map"></div>

#map{
    width: 100%;
    height: 100vh;
}

let mapOptions = {
    center:[34.2121525, 108.8284321],
    zoom:10
}


let map = new L.map('map' , mapOptions);

let layer = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png');
map.addLayer(layer);

let marker = new L.Marker([34.2121525, 108.8284321]);
marker.addTo(map);