I changed the size and location of the map, and the position of the two markers.
var map = new H.Map(document.getElementById('map'), defaultLayers.normal.map,{ center: {lat:41.258531, lng:-96.012599}, zoom: 13 }); //Step 3: make the map interactive // MapEvents enables the event system // Behavior implements default interactions for pan/zoom (also on mobile touch environments) var behavior = new H.mapevents.Behavior(new H.mapevents.MapEvents(map)); // Create the default UI components var ui = H.ui.UI.createDefault(map, defaultLayers); // Now use the map as required... addMarkersToMap(map);