var map = L.map('map').setView([51.505, -0.09], 13); L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { attribution: '© OpenStreetMap contributors' }).addTo(map); L.marker([51.5, -0.09]).addTo(map) .bindPopup('A pretty CSS3 popup.
Easily customizable.') .openPopup();