diff --git a/_posts/2023-10-30-maps-3.md b/_posts/2023-10-30-maps-3.md
new file mode 100644
index 0000000..9ebcca6
--- /dev/null
+++ b/_posts/2023-10-30-maps-3.md
@@ -0,0 +1,81 @@
+---
+title: "Interactive web maps from a static file"
+layout: post
+excerpt: |
+    PMTiles is a cool new technology to serve interactive vector maps from a static file. 
+
+image: 
+thumbnail: 
+head: |
+        <link rel="stylesheet" href="https://unpkg.com/maplibre-gl@3.3.1/dist/maplibre-gl.css" crossorigin="anonymous">
+        <script src="https://unpkg.com/maplibre-gl@3.3.1/dist/maplibre-gl.js" crossorigin="anonymous"></script>
+        <script src="https://unpkg.com/pmtiles@2.11.0/dist/index.js"></script>
+---
+PMTiles is a new project that lets you serve vector map data from static files through the magic of HTTP range requests.
+
+By following this [blog post][blog] and throwing in a bit of code from [the official examples][official_examples] I've put together this little map below. The vector data is entirely served from a static file on this server. Most interactive web maps work by constantly requesting little map images from an external server at different zoom levels. This approach uses much less data and doesn't require an external server to host all the map data.
+
+[blog]: https://til.simonwillison.net/gis/pmtiles
+[official_examples]: https://github.com/protomaps/PMTiles/blob/main/js/examples/maplibre.html
+
+<figure id="map" style="width:100%; height:500px;"></figure>
+
+<script type="text/javascript">
+    async function main() {
+    // add the PMTiles plugin to the maplibregl global.
+    let protocol = new pmtiles.Protocol();
+    maplibregl.addProtocol("pmtiles",protocol.tile);
+
+    let PMTILES_URL = "/assets/blog/pmtiles/hackney.pmtiles";
+
+    const p = new pmtiles.PMTiles(PMTILES_URL);
+    // this is so we share one instance across the JS code and the map renderer
+    protocol.add(p);
+
+    let isDark = (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches)
+
+    async function getLayers(isDark) {
+        let style_name = isDark ? "/dark.json" : "/light.json";
+        const base = '{{"/assets/blog/pmtiles/" | relative_url}}';
+        let resp = await fetch(base + style_name);
+        let layers = await resp.json();
+        return layers;
+    }
+
+    let style = {
+            version:8,
+            glyphs: "https://cdn.protomaps.com/fonts/pbf/{fontstack}/{range}.pbf",
+            sources: {
+                "static_hackney": {
+                    type: "vector",
+                    url: "pmtiles://" + PMTILES_URL,
+                    attribution: '© <a href="https://openstreetmap.org">OpenStreetMap</a>'
+                }
+            },
+            layers: await getLayers(isDark),
+        }
+
+    let map = new maplibregl.Map({
+        container: 'map',
+        style: style,
+    });
+    // map.showTileBoundaries = true;
+
+    map.on("load", () => {
+        const myBounds = map.getSource("static_hackney").bounds;
+        map.setMaxBounds(myBounds);
+    });
+
+    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', async event => {
+        let isDark = event.matches;
+        console.log(isDark);
+        style.layers = await getLayers(isDark);
+        console.log(style);
+        map.setStyle(style);
+    });
+
+    };
+
+    main();
+
+</script>
\ No newline at end of file
diff --git a/_sass/main.scss b/_sass/main.scss
index 51fbd25..ca9d684 100644
--- a/_sass/main.scss
+++ b/_sass/main.scss
@@ -123,7 +123,7 @@ figure > img, figure > svg, figure > canvas {
         padding-top: 10px; 
         padding-left: 20px;
         padding-right: 20px;
-        margin: 0px;
+        margin: auto;
         justify-content: flex-start;
         }
     
diff --git a/assets/blog/pmtiles/black.json b/assets/blog/pmtiles/black.json
new file mode 100644
index 0000000..c680cb7
--- /dev/null
+++ b/assets/blog/pmtiles/black.json
@@ -0,0 +1,3215 @@
+[
+  {
+    "id": "background",
+    "type": "background",
+    "paint": {
+      "background-color": "#2b2b2b"
+    }
+  },
+  {
+    "id": "earth",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "earth",
+    "paint": {
+      "fill-color": "#141414"
+    }
+  },
+  {
+    "id": "landuse_park",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind",
+        "national_park",
+        "park",
+        "cemetery",
+        "protected_area",
+        "nature_reserve",
+        "forest",
+        "golf_course"
+      ]
+    ],
+    "paint": {
+      "fill-color": [
+        "interpolate",
+        [
+          "linear"
+        ],
+        [
+          "zoom"
+        ],
+        0,
+        "#181818",
+        12,
+        "#181818"
+      ]
+    }
+  },
+  {
+    "id": "landuse_hospital",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "==",
+        "pmap:kind",
+        "hospital"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#1d1d1d"
+    }
+  },
+  {
+    "id": "landuse_industrial",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "==",
+        "pmap:kind",
+        "industrial"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#101010"
+    }
+  },
+  {
+    "id": "landuse_school",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind",
+        "school",
+        "university",
+        "college"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#111111"
+    }
+  },
+  {
+    "id": "landuse_beach",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind",
+        "beach"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#1f1f1f"
+    }
+  },
+  {
+    "id": "landuse_zoo",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind",
+        "zoo"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#191919"
+    }
+  },
+  {
+    "id": "landuse_military",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind",
+        "military",
+        "naval_base",
+        "airfield"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#191919"
+    }
+  },
+  {
+    "id": "natural_wood",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "natural",
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind",
+        "wood",
+        "nature_reserve",
+        "forest"
+      ]
+    ],
+    "paint": {
+      "fill-color": [
+        "interpolate",
+        [
+          "linear"
+        ],
+        [
+          "zoom"
+        ],
+        0,
+        "#1a1a1a",
+        12,
+        "#1a1a1a"
+      ]
+    }
+  },
+  {
+    "id": "landuse_pedestrian",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "==",
+        "pmap:kind",
+        "pedestrian"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#191919"
+    }
+  },
+  {
+    "id": "natural_scrub",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "natural",
+    "filter": [
+      "in",
+      "pmap:kind",
+      "scrub",
+      "grassland",
+      "grass"
+    ],
+    "paint": {
+      "fill-color": [
+        "interpolate",
+        [
+          "linear"
+        ],
+        [
+          "zoom"
+        ],
+        0,
+        "#1c1c1c",
+        12,
+        "#1c1c1c"
+      ]
+    }
+  },
+  {
+    "id": "natural_glacier",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "natural",
+    "filter": [
+      "==",
+      "pmap:kind",
+      "glacier"
+    ],
+    "paint": {
+      "fill-color": "#191919"
+    }
+  },
+  {
+    "id": "natural_sand",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "natural",
+    "filter": [
+      "==",
+      "pmap:kind",
+      "sand"
+    ],
+    "paint": {
+      "fill-color": "#161616"
+    }
+  },
+  {
+    "id": "landuse_aerodrome",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind",
+        "aerodrome"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#191919"
+    }
+  },
+  {
+    "id": "transit_runway",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "transit",
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind_detail",
+        "runway"
+      ]
+    ],
+    "paint": {
+      "line-color": "#323232",
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        10,
+        0,
+        12,
+        4,
+        18,
+        30
+      ]
+    }
+  },
+  {
+    "id": "transit_taxiway",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "transit",
+    "minzoom": 13,
+    "filter": [
+      "any",
+      [
+        "in",
+        "pmap:kind_detail",
+        "taxiway"
+      ]
+    ],
+    "paint": {
+      "line-color": "#323232",
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        13,
+        0,
+        13.5,
+        1,
+        15,
+        6
+      ]
+    }
+  },
+  {
+    "id": "water",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "water",
+    "paint": {
+      "fill-color": "#333333"
+    }
+  },
+  {
+    "id": "landuse_pier",
+    "type": "fill",
+    "source": "static_hackney",
+    "source-layer": "landuse",
+    "filter": [
+      "any",
+      [
+        "==",
+        "pmap:kind",
+        "pier"
+      ]
+    ],
+    "paint": {
+      "fill-color": "#0a0a0a"
+    }
+  },
+  {
+    "id": "roads_tunnels_other_casing",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "in",
+        "pmap:kind",
+        "other",
+        "path"
+      ]
+    ],
+    "paint": {
+      "line-color": "#101010",
+      "line-gap-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        14,
+        0,
+        20,
+        7
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_minor_casing",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:kind",
+        "minor_road"
+      ]
+    ],
+    "paint": {
+      "line-color": "#101010",
+      "line-dasharray": [
+        3,
+        2
+      ],
+      "line-gap-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        11,
+        0,
+        12.5,
+        0.5,
+        15,
+        2,
+        18,
+        11
+      ],
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        12,
+        0,
+        12.5,
+        1
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_link_casing",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:link",
+        1
+      ]
+    ],
+    "paint": {
+      "line-color": "#101010",
+      "line-dasharray": [
+        3,
+        2
+      ],
+      "line-gap-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        13,
+        0,
+        13.5,
+        1,
+        18,
+        11
+      ],
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        12,
+        0,
+        12.5,
+        1
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_medium_casing",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:kind",
+        "medium_road"
+      ]
+    ],
+    "paint": {
+      "line-color": "#101010",
+      "line-dasharray": [
+        3,
+        2
+      ],
+      "line-gap-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        7,
+        0,
+        7.5,
+        0.5,
+        18,
+        13
+      ],
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        10,
+        0,
+        10.5,
+        1
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_major_casing",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:kind",
+        "major_road"
+      ]
+    ],
+    "paint": {
+      "line-color": "#101010",
+      "line-dasharray": [
+        3,
+        2
+      ],
+      "line-gap-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        7,
+        0,
+        7.5,
+        0.5,
+        18,
+        13
+      ],
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        9,
+        0,
+        9.5,
+        1
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_highway_casing",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:kind",
+        "highway"
+      ],
+      [
+        "!=",
+        "pmap:link",
+        1
+      ]
+    ],
+    "paint": {
+      "line-color": "#101010",
+      "line-dasharray": [
+        6,
+        0.5
+      ],
+      "line-gap-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        3,
+        0,
+        3.5,
+        0.5,
+        18,
+        15
+      ],
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        7,
+        0,
+        7.5,
+        1,
+        20,
+        15
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_other",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "in",
+        "pmap:kind",
+        "other",
+        "path"
+      ]
+    ],
+    "paint": {
+      "line-color": "#292929",
+      "line-dasharray": [
+        4.5,
+        0.5
+      ],
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        14,
+        0,
+        20,
+        7
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_minor",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:kind",
+        "minor_road"
+      ]
+    ],
+    "paint": {
+      "line-color": "#292929",
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        11,
+        0,
+        12.5,
+        0.5,
+        15,
+        2,
+        18,
+        11
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_link",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:link",
+        1
+      ]
+    ],
+    "paint": {
+      "line-color": "#292929",
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        13,
+        0,
+        13.5,
+        1,
+        18,
+        11
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_medium",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:kind",
+        "medium_road"
+      ]
+    ],
+    "paint": {
+      "line-color": "#292929",
+      "line-width": [
+        "interpolate",
+        [
+          "exponential",
+          1.6
+        ],
+        [
+          "zoom"
+        ],
+        7,
+        0,
+        12,
+        1.2,
+        15,
+        3,
+        18,
+        13
+      ]
+    }
+  },
+  {
+    "id": "roads_tunnels_major",
+    "type": "line",
+    "source": "static_hackney",
+    "source-layer": "roads",
+    "filter": [
+      "all",
+      [
+        "<",
+        "pmap:level",
+        0
+      ],
+      [
+        "==",
+        "pmap:kind",
+        "major_road"
+      ]
+    ],
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\ No newline at end of file
diff --git a/assets/blog/pmtiles/dark.json b/assets/blog/pmtiles/dark.json
new file mode 100644
index 0000000..986e483
--- /dev/null
+++ b/assets/blog/pmtiles/dark.json
@@ -0,0 +1,3215 @@
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index 0000000..692caf3
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diff --git a/assets/blog/pmtiles/layers.json b/assets/blog/pmtiles/layers.json
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diff --git a/assets/blog/pmtiles/light.json b/assets/blog/pmtiles/light.json
new file mode 100644
index 0000000..bd701af
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