diff --git a/package-lock.json b/package-lock.json
index 6398ecf..e8eaf51 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,9 @@
       "devDependencies": {
         "@rgossiaux/svelte-headlessui": "^1.0.2",
         "@rgossiaux/svelte-heroicons": "^0.1.2",
+        "@sveltejs/pancake": "^0.0.18",
         "@sveltejs/vite-plugin-svelte": "^2.0.2",
+        "d3-hierarchy": "^3.1.2",
         "marked": "^4.2.4",
         "svelte": "^3.55.0",
         "vite": "^4.0.3"
@@ -454,6 +456,15 @@
         "svelte": "^3.44.0"
       }
     },
+    "node_modules/@sveltejs/pancake": {
+      "version": "0.0.18",
+      "resolved": "https://registry.npmjs.org/@sveltejs/pancake/-/pancake-0.0.18.tgz",
+      "integrity": "sha512-vnpKn+sHE0yvw/6x4juF9EoDS8iYC5JNIVtRgclA37rfxdnIpvbVxStiZ5/gWncjERN4jtSpTAplS1zCARCBXA==",
+      "dev": true,
+      "dependencies": {
+        "yootils": "0.0.16"
+      }
+    },
     "node_modules/@sveltejs/vite-plugin-svelte": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/@sveltejs/vite-plugin-svelte/-/vite-plugin-svelte-2.0.2.tgz",
@@ -525,6 +536,15 @@
       "optional": true,
       "peer": true
     },
+    "node_modules/d3-hierarchy": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/d3-hierarchy/-/d3-hierarchy-3.1.2.tgz",
+      "integrity": "sha512-FX/9frcub54beBdugHjDCdikxThEqjnR93Qt7PvQTOHxyiNCAlvMrHhclk3cD5VeAaq9fxmfRp+CnWw9rEMBuA==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
@@ -887,6 +907,12 @@
           "optional": true
         }
       }
+    },
+    "node_modules/yootils": {
+      "version": "0.0.16",
+      "resolved": "https://registry.npmjs.org/yootils/-/yootils-0.0.16.tgz",
+      "integrity": "sha512-aIVecm5ucOzwhtKbl0zkfg0ZSOUR9c2da0k8cIc9umjjzkvVCWUUX/UHZ1CLPsv4wmJLqt0aWeLB7p9n9JDwYQ==",
+      "dev": true
     }
   },
   "dependencies": {
@@ -1117,6 +1143,15 @@
       "dev": true,
       "requires": {}
     },
+    "@sveltejs/pancake": {
+      "version": "0.0.18",
+      "resolved": "https://registry.npmjs.org/@sveltejs/pancake/-/pancake-0.0.18.tgz",
+      "integrity": "sha512-vnpKn+sHE0yvw/6x4juF9EoDS8iYC5JNIVtRgclA37rfxdnIpvbVxStiZ5/gWncjERN4jtSpTAplS1zCARCBXA==",
+      "dev": true,
+      "requires": {
+        "yootils": "0.0.16"
+      }
+    },
     "@sveltejs/vite-plugin-svelte": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/@sveltejs/vite-plugin-svelte/-/vite-plugin-svelte-2.0.2.tgz",
@@ -1174,6 +1209,12 @@
       "optional": true,
       "peer": true
     },
+    "d3-hierarchy": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/d3-hierarchy/-/d3-hierarchy-3.1.2.tgz",
+      "integrity": "sha512-FX/9frcub54beBdugHjDCdikxThEqjnR93Qt7PvQTOHxyiNCAlvMrHhclk3cD5VeAaq9fxmfRp+CnWw9rEMBuA==",
+      "dev": true
+    },
     "debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
@@ -1397,6 +1438,12 @@
       "integrity": "sha512-fanAXjSaf9xXtOOeno8wZXIhgia+CZury481LsDaV++lSvcU2R9Ch2bPh3PYFyoHW+w9LqAeYRISVQjUIew14g==",
       "dev": true,
       "requires": {}
+    },
+    "yootils": {
+      "version": "0.0.16",
+      "resolved": "https://registry.npmjs.org/yootils/-/yootils-0.0.16.tgz",
+      "integrity": "sha512-aIVecm5ucOzwhtKbl0zkfg0ZSOUR9c2da0k8cIc9umjjzkvVCWUUX/UHZ1CLPsv4wmJLqt0aWeLB7p9n9JDwYQ==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index f6dae67..fa5817f 100644
--- a/package.json
+++ b/package.json
@@ -12,8 +12,10 @@
   "devDependencies": {
     "@rgossiaux/svelte-headlessui": "^1.0.2",
     "@rgossiaux/svelte-heroicons": "^0.1.2",
-	"@sveltejs/vite-plugin-svelte": "^2.0.2",
-	"marked": "^4.2.4",
+    "@sveltejs/pancake": "^0.0.18",
+    "@sveltejs/vite-plugin-svelte": "^2.0.2",
+    "d3-hierarchy": "^3.1.2",
+    "marked": "^4.2.4",
     "svelte": "^3.55.0",
     "vite": "^4.0.3"
   }
diff --git a/public/map.html b/public/map.html
deleted file mode 100644
index 0323a44..0000000
--- a/public/map.html
+++ /dev/null
@@ -1,345 +0,0 @@
-<!doctype html>
-<html class="no-js" lang="">
-    <head>
-        <meta charset="utf-8">
-        <meta http-equiv="X-UA-Compatible" content="IE=edge">
-        <title>TreeMap</title>
-        <meta name="description" content="">
-        <meta name="viewport" content="width=device-width, initial-scale=1">
-        <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
-        <style>
-body {
-  margin: 0px;
-  padding: 0px;
-  font-family: 'Open Sans', sans-serif;
-  font-size: 16px;
-}
-
-#chart {
-  margin: 0px;
-  padding: 0px;
-  background: #E0E7FF;
-}
-
-text {
-  cursor: pointer;
-  fill: #171717;
-  
-}
-
-.grandparent text {
-  font-weight: bold;
-}
-
-rect {
-  fill: none;
-  stroke: #fff;
-}
-
-rect.parent,
-.grandparent rect {
-  stroke-width: 2px;
-}
-
-.grandparent rect {
-  fill: #F68787;
-}
-
-.grandparent:hover rect {
-  fill: #FB3569;
-}
-
-.children rect.parent,
-.grandparent rect {
-  cursor: pointer;
-}
-
-.leaf rect.parent {
-  cursor: pointer;
-  fill: #B7FBFF;
-}
-
-.leaf rect.parent:hover {
-  cursor: pointer;
-  fill: #51EAEA;
-}
-
-.children rect.parent {
-  fill: #F1EB9A;
-  fill-opacity: .5;
-}
-
-.children:hover rect.child {
-  fill: #F8A978;
-}
-
-        </style>
-
-	<link href='https://fonts.googleapis.com/css?family=Open+Sans:300' rel='stylesheet' type='text/css'>
-    </head>
-    <body>
-    <div style="text-align: right;">
-      <a href="https://github.com/learn-awesome/learndb" target="_blank" style="text-decoration:underline; padding: 2px 3px; font-weight: 700;">Help us improve this taxonomy</a>
-    </div>
-	<p id="chart"></p>
-    <script type="text/javascript">
-
-function hierarchy(topic_array, parent_name){
-    // this is different from TopicMasonryGrid because this needs a specific object structure down to all leafs, not a map with just 2 levels
-    // every node needs id, name. Leaf nodes need a value like 100. Non-leafs need a children[].
-    // see: https://github.com/mekarpeles/math.mx/blob/master/static/data/simple.json
-    const nest = (items, id) =>
-      items
-      .filter(item => item.parent_name === id)
-      .map(item => ({ ...item, children: nest(items, item.name), value: 100 }))
-      .map(item => {
-        return item.children.length == 0 ?
-        {id: item.name, name: item.name, value: 100} :
-        {id: item.name, name: item.name, children: item.children}
-      });
-
-    let topnodes = nest(topic_array, null); // includes childless nodes
-
-    // put childless nodes under misc
-    let misc = {id: 'misc', name: 'Misc', children: topnodes.filter(t => t.value).slice(0,15)};
-
-
-    return {name: "", children: [...topnodes.filter(t => t.children), misc]};
-}
-
-d3.json("/alltopics.json", function(alltopics){
-  // console.log({alltopics});
-  var root = hierarchy(alltopics, null);
-  // console.log({root});
-  initialize(root);
-  accumulate(root);
-  layout(root);
-  display(root);
-});
-
-var margin = {top: 30, right: 0, bottom: 0, left: 0},
-wh = browserDimensions(),
-width = wh[0] - (2 * margin.left) - (2*margin.right),
-height = wh[1] - (2 * margin.top - margin.bottom),
-formatNumber = d3.format(",d"),
-transitioning;
-
-var x = d3.scale.linear()
-  .domain([0, width])
-  .range([0, width]);
-
-var y = d3.scale.linear()
-  .domain([0, height])
-  .range([0, height]);
-
-var treemap = d3.layout.treemap()
-  .children(function(d, depth) { return depth ? null : d._children; })
-  .sort(function(a, b) { return a.value - b.value; })
-  .ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
-  .round(false);
-
-var svg = d3.select("#chart").append("svg")
-  .attr("width", width + margin.left + margin.right)
-  .attr("height", height + margin.bottom + margin.top)
-  .style("margin-left", -margin.left + "px")
-  .style("margin.right", -margin.right + "px")
-  .append("g")
-  .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
-  .style("shape-rendering", "crispEdges");
-
-var grandparent = svg.append("g")
-  .attr("class", "grandparent");
-
-grandparent.append("rect")
-  .attr("y", -margin.top)
-  .attr("width", width)
-  .attr("height", margin.top);
-
-grandparent.append("text")
-  .attr("x", 6)
-  .attr("y", 6 - margin.top)
-  .attr("dy", ".75em");
-  
-
-
-  function initialize(root) {
-    root.x = root.y = 0;
-    root.dx = width;
-    root.dy = height;
-    root.depth = 0;
-  }
-
-  // Aggregate the values for internal nodes. This is normally done by the
-  // treemap layout, but not here because of our custom implementation.
-  // We also take a snapshot of the original children (_children) to avoid
-  // the children being overwritten when when layout is computed.
-  function accumulate(d) {
-    return (d._children = d.children)
-      ? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
-    : d.value;
-  }
-
-  // Compute the treemap layout recursively such that each group of siblings
-  // uses the same size (1×1) rather than the dimensions of the parent cell.
-  // This optimizes the layout for the current zoom state. Note that a wrapper
-  // object is created for the parent node for each group of siblings so that
-  // the parent’s dimensions are not discarded as we recurse. Since each group
-  // of sibling was laid out in 1×1, we must rescale to fit using absolute
-  // coordinates. This lets us use a viewport to zoom.
-  function layout(d) {
-    if (d._children) {
-      treemap.nodes({_children: d._children});
-      d._children.forEach(function(c) {
-        c.x = d.x + c.x * d.dx;
-        c.y = d.y + c.y * d.dy;
-        c.dx *= d.dx;
-        c.dy *= d.dy;
-        c.parent = d;
-        layout(c);
-      });
-    }
-  }
-
-  function display(d) {
-    grandparent
-      .datum(d.parent)
-      .on("click", transition)
-      .select("text")
-      .text(name(d));
-
-    var g1 = svg.insert("g", ".grandparent")
-      .datum(d)
-      .attr("class", "depth");
-
-    var g = g1.selectAll("g")
-      .data(d._children)
-      .enter().append("g");
-
-    g.filter(function(d) { return d._children; })
-      .classed("children", true)
-      .on("click", transition);
-
-    g.filter(function(d) { return !d._children; })
-      .classed("leaf", true)
-      .on("click",(n) => { window.parent.location.href = "/#/topic/" + n.name;});
-
-    g.filter(function(d) { return d._children; }).selectAll(".child")
-      .data(function(d) { return d._children || [d]; })
-      .enter().append("rect")
-      .attr("class", "child")
-      .call(rect);
-
-    g.append("rect")
-      .attr("class", "parent")
-      .call(rect)
-      .append("title")
-      .text(function(d) { return formatNumber(d.value); });
-
-    g.append("text")
-      .attr("dy", ".75em")
-      .on("click", (n) => { window.parent.location.href = "/#/topic/" + n.name;})
-      .text(function(d) { return d.name.split('/').reverse()[0].split('{')[0].split('(')[0]
-			  .split('[')[0]; })
-      .call(text);
-
-    function transition(d) {
-      if (transitioning || !d) return;
-      transitioning = true;
-
-      var g2 = display(d),
-      t1 = g1.transition().duration(750),
-      t2 = g2.transition().duration(750);
-
-      // Update the domain only after entering new elements.
-      x.domain([d.x, d.x + d.dx]);
-      y.domain([d.y, d.y + d.dy]);
-
-      // Enable anti-aliasing during the transition.
-      svg.style("shape-rendering", null);
-
-      // Draw child nodes on top of parent nodes.
-      svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });
-
-      // Fade-in entering text.
-      g2.selectAll("text").style("fill-opacity", 0);
-
-      // Transition to the new view.
-      t1.selectAll("text").call(text).style("fill-opacity", 0);
-      t2.selectAll("text").call(text).style("fill-opacity", 1);
-      t1.selectAll("rect").call(rect);
-      t2.selectAll("rect").call(rect);
-
-      // Remove the old node when the transition is finished.
-      t1.remove().each("end", function() {
-        svg.style("shape-rendering", "crispEdges");
-        transitioning = false;
-      });
-    }
-
-    return g;
-  }
-
-  function text(text) {
-    text.attr("x", function(d) { return x(d.x) + 10; })
-      .attr("y", function(d) { return y(d.y) + 10; })
-      .attr("text-decoration","underline");
-  }
-
-  function rect(rect) {
-    rect.attr("x", function(d) { return x(d.x); })
-      .attr("y", function(d) { return y(d.y); })
-      .attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
-      .attr("height", function(d) { return y(d.y + d.dy) - y(d.y); });
-  }
-
-  function name(d) {
-    return d.parent
-      ? name(d.parent) + " → " + d.name
-      : d.name;
-  }
-
-function wrap(text, width) {
-  text.each(function() {
-    var text = d3.select(this),
-    words = text.text().split(/\s+/).reverse(),
-    word,
-    line = [],
-    lineNumber = 0,
-    lineHeight = 1.1, // ems
-    y = text.attr("y"),
-    dy = parseFloat(text.attr("dy")),
-    tspan = text.text(null).append("tspan").attr("x", 0).attr("y", y).attr("dy", dy + "em");
-    while (word = words.pop()) {
-      line.push(word);
-      tspan.text(line.join(" "));
-      if (tspan.node().getComputedTextLength() > width) {
-        line.pop();
-        tspan.text(line.join(" "));
-        line = [word];
-        tspan = text.append("tspan").attr("x", 0).attr("y", y).attr("dy", ++lineNumber * lineHeight + dy + "em").text(word);
-      }
-    }
-  });
-}
-function browserDimensions() {
-  var w = 0, h = 0;
-  if( typeof( window.innerWidth ) == 'number' ) {
-    //Non-IE
-    w = window.innerWidth;
-    h = window.innerHeight;
-  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
-    //IE 6+ in 'standards compliant mode'
-    w = document.documentElement.clientWidth;
-    h = document.documentElement.clientHeight;
-  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
-    //IE 4 compatible
-    w = document.body.clientWidth;
-    h = document.body.clientHeight;
-  }
-  return [w, h];
-}
-
-
-        </script>
-    </body>
-</html>
\ No newline at end of file
diff --git a/src/PancakeTreemap.svelte b/src/PancakeTreemap.svelte
new file mode 100644
index 0000000..1ba31a8
--- /dev/null
+++ b/src/PancakeTreemap.svelte
@@ -0,0 +1,20 @@
+<script>
+	import TreemapNode from './TreemapNode.svelte';
+
+	export let root;
+</script>
+
+<pancake-treemap>
+	<TreemapNode node={root} let:node>
+		<slot {node}></slot>
+	</TreemapNode>
+</pancake-treemap>
+
+<style>
+	pancake-treemap {
+		position: absolute;
+		width: 100%;
+		height: 100%;
+		pointer-events: none;
+	}
+</style>
\ No newline at end of file
diff --git a/src/TreeMap.svelte b/src/TreeMap.svelte
index 20c5135..1494b31 100644
--- a/src/TreeMap.svelte
+++ b/src/TreeMap.svelte
@@ -1 +1,181 @@
-<iframe title="treemap" src="/map.html" class="w-full h-screen"></iframe>
\ No newline at end of file
+<script>
+	import * as Pancake from '@sveltejs/pancake';
+	import * as d3 from 'd3-hierarchy';
+	import { tweened } from 'svelte/motion';
+	import * as eases from 'svelte/easing';
+	import { fade } from 'svelte/transition';
+	import * as yootils from 'yootils';
+	import PancakeTreemap from './PancakeTreemap.svelte';
+	import topics from '../db/topics.json';
+
+	const treemap = d3.treemap();
+
+	const build_hierarchy = (topic_array, parent_name) => {
+		// this is different from TopicMasonryGrid because this needs a specific object structure down to all leafs, not a map with just 2 levels
+		// every node needs id, name. Leaf nodes need a value like 100. Non-leafs need a children[].
+		// see: https://github.com/mekarpeles/math.mx/blob/master/static/data/simple.json
+		const nest = (items, id) =>
+		items
+		.filter(item => item.parent_name === id)
+		.map(item => ({ ...item, children: nest(items, item.name), value: 100 }))
+		.map(item => {
+			return item.children.length == 0 ?
+			{id: item.name, name: item.name, value: 100} :
+			{id: item.name, name: item.name, children: item.children}
+		});
+
+		let topnodes = nest(topic_array, null); // includes childless nodes
+
+		// put childless nodes under misc
+		let misc = {id: 'misc', name: 'Misc', children: topnodes.filter(t => t.value).slice(0,15)};
+
+
+		return {name: "", children: [...topnodes.filter(t => t.children), misc]};
+	}
+
+	const hierarchy = d3.hierarchy(build_hierarchy(topics, null))
+		.sum(d => d.value)
+		.sort((a, b) => b.value - a.value)
+
+	const root = treemap(hierarchy);
+
+	let selected = root;
+
+	const select = node => {
+		while (node.parent && node.parent !== selected) {
+			node = node.parent;
+		}
+
+		if (node && node.children) {
+			selected = node;
+		} else {
+			window.location.href = "/#/topic/" + node.data.name;
+		}
+	};
+
+	const breadcrumbs = node => {
+		const crumbs = [];
+		while (node) {
+			crumbs.unshift(node.data.name)
+			node = node.parent;
+		}
+
+		return crumbs.join('/');
+	};
+
+	const extents = tweened(undefined, {
+		easing: eases.cubicOut,
+		duration: 600
+	});
+
+	const is_visible = (a, b) => {
+		while (b) {
+			if (a.parent === b) return true;
+			b = b.parent;
+		}
+
+		return false;
+	};
+
+	$: $extents = {
+		x1: selected.x0,
+		x2: selected.x1,
+		y1: selected.y1,
+		y2: selected.y0
+	};
+</script>
+
+<button class="breadcrumbs" disabled="{!selected.parent}" on:click="{() => selected = selected.parent}">
+	{breadcrumbs(selected)}
+</button>
+
+<div class="chart">
+	<Pancake.Chart x1={$extents.x1} x2={$extents.x2} y1={$extents.y1} y2={$extents.y2}>
+		<PancakeTreemap {root} let:node>
+			{#if is_visible(node, selected)}
+				<div
+					transition:fade={{duration:400}}
+					class="node"
+					class:leaf={!node.children}
+					on:click="{() => select(node)}"
+				>
+					<div class="pancontents">
+						<strong on:click|stopPropagation={() => window.location.href = "/#/topic/" + node.data.name}>
+							{node.data.name.split('/').reverse()[0]}
+						</strong>
+					</div>
+				</div>
+			{/if}
+		</PancakeTreemap>
+	</Pancake.Chart>
+</div>
+
+<style>
+	.breadcrumbs {
+		width: 100%;
+		padding: 0.3rem 0.4rem;
+		background-color: transparent;
+		font-family: inherit;
+		font-size: inherit;
+		text-align: left;
+		border: none;
+		cursor: pointer;
+		outline: none;
+	}
+
+	.breadcrumbs:disabled {
+		cursor: default;
+	}
+
+	.chart {
+		width: calc(100% + 2px);
+		height: 900px;
+		padding: 0;
+		margin: 0 -1px 36px -1px;
+		overflow: hidden;
+	}
+
+	.node {
+		position: absolute;
+		width: 100%;
+		height: 100%;
+		background-color: white;
+		overflow: hidden;
+		pointer-events: all;
+		cursor: pointer;
+	}
+
+	.pancontents {
+		width: 100%;
+		height: 100%;
+		padding: 0.3rem 0.4rem;
+		border: 1px solid white;
+		background-color: hsl(240, 8%, 70%);
+		color: white;
+		border-radius: 4px;
+		box-sizing: border-box;
+	}
+
+	.pancontents:hover {
+		background-color: #F1EB9A;
+		color: black;
+	}
+
+	.node:not(.leaf) .pancontents {
+		background-color: hsl(240, 8%, 44%);
+	}
+
+	.node:not(.leaf) .pancontents:hover {
+		background-color: #F1EB9A;
+	}
+
+	strong {
+		display: block;
+		font-size: 16px;
+		white-space: nowrap;
+		line-height: 1;
+		text-decoration: underline;
+	}
+
+
+</style>
\ No newline at end of file
diff --git a/src/TreemapNode.svelte b/src/TreemapNode.svelte
new file mode 100644
index 0000000..7166a54
--- /dev/null
+++ b/src/TreemapNode.svelte
@@ -0,0 +1,16 @@
+<script>
+	import * as Pancake from '@sveltejs/pancake';
+	import { getContext } from 'svelte';
+
+	export let node;
+</script>
+
+<Pancake.Box x1={node.x0} x2={node.x1} y1={node.y1} y2={node.y0}>
+	<slot {node}></slot>
+</Pancake.Box>
+
+{#each (node.children || []) as child}
+	<svelte:self node={child} let:node>
+		<slot {node}></slot>
+	</svelte:self>
+{/each}
\ No newline at end of file
diff --git a/vite.config.js b/vite.config.js
index 98d1bcd..e1a195c 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -1,17 +1,9 @@
 import { defineConfig } from 'vite'
 import { svelte } from '@sveltejs/vite-plugin-svelte'
-import fs from 'fs';
-
-function copyTopicJSONToPublic(){
-	// This is needed for map.html which needs to fetch all topics from server
-	console.log("Copying db/topics.json to public/alltopics.json ...");
-	fs.copyFileSync("db/topics.json", "public/alltopics.json")
-}
 
 // https://vitejs.dev/config/
 export default defineConfig({
   plugins: [
-	copyTopicJSONToPublic(),
 	svelte()
   ],
 })
\ No newline at end of file