A quick pen to show integration with Google Maps and Leaflet.js into a web page. For leaflet to work you need to make sure you include their JS file and CSS file as you can see here if you look at the details for those areas. See comments in HTML for how to change default Google Maps zoom level and comments in JS for how to change the default zoom and location for leaflet.
Google MapSee the Pen by chris0stein (@chris0stein) on CodePen.