Oblique Leaflet map

What

In this map I'm attempting to do a couple things.

Create an oblique Leaflet map (Drawing on this little tutorial from Peter Liu at Mapbox)
Use the leaflet-boundary-canvas plugin to display a cutout of night time imagery of Kentucky

Issues

~~tiles load unreliably. They flicker in and out of view. What's going on here?~~ SOLVED!
As you pan the map, scroll bars show up in the window (no big deal. just curious)

Next step

add markers
do something meaningful.

<!DOCTYPE html>
<html>
<head>
    <title>Oblique Leaflet</title>
    <link rel="stylesheet" href="https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.min.js"></script>
    <script src="https://leaflet-extras.github.io/leaflet-providers/leaflet-providers.js"></script>
    <script src="https://cdn.jsdelivr.net/gh/aparshin/leaflet-boundary-canvas/src/boundarycanvas.js"></script>
    <script src="ky-buff.js"></script>
    
    <style>
        html, body, #map {
            height: 100%;
            margin: 0px;
        }
        body {
            perspective: 1200;
        }
        #map {
            overflow: visible;
            -webkit-transform: rotateX(-70deg) rotateZ(25deg);
            transform: rotateX(-70deg) rotateZ(25deg);
        }
        .leaflet-container {
            background: none;
        }
        
        .leaflet-layer:last-child {
            transform:translateZ(1px);
        }

#map, #map * {
            -webkit-transform-style:preserve-3d;
            transform-style:preserve-3d;
        }
    </style>
</head>

var base = L.tileLayer.provider('CartoDB.DarkMatterNoLabels').addTo(map); 
        
        var withBoundary = function(providerName) {
            return L.TileLayer.BoundaryCanvas.createFromLayer(
                L.tileLayer.provider(providerName),
                {boundary: geom
                }
            )
        }
        
        var night = withBoundary('NASAGIBS.ViirsEarthAtNight2012').addTo(map);
       
    </script>
</body>
</html>

Modified http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js to a secure url

Modified http://leaflet-extras.github.io/leaflet-providers/leaflet-providers.js to a secure url

Updated missing url https://rawgit.com/aparshin/leaflet-boundary-canvas/master/src/BoundaryCanvas.js to https://cdn.jsdelivr.net/gh/aparshin/leaflet-boundary-canvas/src/boundarycanvas.js

https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js

https://leaflet-extras.github.io/leaflet-providers/leaflet-providers.js

https://rawgit.com/aparshin/leaflet-boundary-canvas/master/src/BoundaryCanvas.js